doc: add missing API content

Some API material (from doxygen comments) wasn't included in the
generated documentation because there was no doxygengroup Sphinx
directive to display them. This PR add content into appropriate places
in existing documentation (e.g., Bluetooth Cryptography APIs into the
Bluetooth API doc) and creates two new collections for Display and
Miscellaneous APIs.

Comments added to the .rst files to mention doxygengroups that are
intentionally excluded (because they're organizational groups containing
subgroups that are included).

Sorted the Bluetooth API list, mostly.

Fixed a couple doxygen group titles defined in the include files, and
added a few patterns to filter new "expected" errors from the document
generation process.

Legacy and deprecated APIs remain left out, as intended:

   http_legacy  (net/http_legacy.h)
   spi_interface_legacy  (spi_legacy.h)
   zoap  (net/zoap.h)

fixes: Issue #5051

Signed-off-by: David B. Kinder <david.b.kinder@intel.com>
diff --git a/doc/api/api.rst b/doc/api/api.rst
index 7ca1344..f26ae55 100644
--- a/doc/api/api.rst
+++ b/doc/api/api.rst
@@ -23,3 +23,5 @@
    io_interfaces.rst
    power_management_api
    file_system
+   display_api
+   misc_api
diff --git a/doc/api/bluetooth.rst b/doc/api/bluetooth.rst
index e618977..4172eb0 100644
--- a/doc/api/bluetooth.rst
+++ b/doc/api/bluetooth.rst
@@ -15,26 +15,12 @@
 connection-related APIs require :option:`CONFIG_BT_CONN` and any
 BR/EDR (Bluetooth Classic) APIs require :option:`CONFIG_BT_BREDR`.
 
-Generic Access Profile (GAP)
-****************************
+.. comment
+   not documenting
+   .. doxygengroup:: bluetooth
 
-.. doxygengroup:: bt_gap
-   :project: Zephyr
-
-Connection Management
-*********************
-
-.. doxygengroup:: bt_conn
-   :project: Zephyr
-
-Generic Attribute Profile (GATT)
-********************************
-
-.. doxygengroup:: bt_gatt
-   :project: Zephyr
-
-Mesh Profile
-************
+Bluetooth Mesh Profile
+**********************
 
 .. doxygengroup:: bt_mesh
    :project: Zephyr
@@ -57,6 +43,12 @@
 .. doxygengroup:: bt_mesh_cfg_srv
    :project: Zephyr
 
+Bluetooth Mesh Health Client Model
+==================================
+
+.. doxygengroup:: bt_mesh_health_cli
+   :project: Zephyr
+
 Bluetooth Mesh Health Server Model
 ==================================
 
@@ -75,23 +67,16 @@
 .. doxygengroup:: bt_mesh_proxy
    :project: Zephyr
 
+Connection Management
+*********************
 
-Universal Unique Identifiers (UUIDs)
-************************************
-
-.. doxygengroup:: bt_uuid
+.. doxygengroup:: bt_conn
    :project: Zephyr
 
-Logical Link Control and Adaptation Protocol (L2CAP)
-****************************************************
+Cryptography
+************
 
-.. doxygengroup:: bt_l2cap
-   :project: Zephyr
-
-Serial Port Emulation (RFCOMM)
-******************************
-
-.. doxygengroup:: bt_rfcomm
+.. doxygengroup:: bt_crypto
    :project: Zephyr
 
 Data Buffers
@@ -100,16 +85,16 @@
 .. doxygengroup:: bt_buf
    :project: Zephyr
 
-Persistent Storage
-******************
+Generic Access Profile (GAP)
+****************************
 
-.. doxygengroup:: bt_storage
+.. doxygengroup:: bt_gap
    :project: Zephyr
 
-HCI Drivers
-***********
+Generic Attribute Profile (GATT)
+********************************
 
-.. doxygengroup:: bt_hci_driver
+.. doxygengroup:: bt_gatt
    :project: Zephyr
 
 HCI RAW channel
@@ -122,3 +107,45 @@
 
 .. doxygengroup:: hci_raw
    :project: Zephyr
+
+HCI Drivers
+***********
+
+.. doxygengroup:: bt_hci_driver
+   :project: Zephyr
+
+Hands Free Profile (HFP)
+************************
+
+.. doxygengroup:: bt_hfp
+   :project: Zephyr
+
+Logical Link Control and Adaptation Protocol (L2CAP)
+****************************************************
+
+.. doxygengroup:: bt_l2cap
+   :project: Zephyr
+
+Persistent Storage
+******************
+
+.. doxygengroup:: bt_storage
+   :project: Zephyr
+
+Serial Port Emulation (RFCOMM)
+******************************
+
+.. doxygengroup:: bt_rfcomm
+   :project: Zephyr
+
+Service Discovery Protocol (SDP)
+********************************
+
+.. doxygengroup:: bt_sdp
+   :project: Zephyr
+
+Universal Unique Identifiers (UUIDs)
+************************************
+
+.. doxygengroup:: bt_uuid
+   :project: Zephyr
diff --git a/doc/api/display_api.rst b/doc/api/display_api.rst
new file mode 100644
index 0000000..364a4f9
--- /dev/null
+++ b/doc/api/display_api.rst
@@ -0,0 +1,20 @@
+.. _display_api:
+
+Display Interface APIs
+######################
+
+.. comment
+   not documenting
+   .. doxygengroup:: display_interfaces
+
+Grove LCD Display
+*****************
+
+.. doxygengroup:: grove_display
+   :project: Zephyr
+
+BBC micro:bit Display
+*********************
+
+.. doxygengroup:: mb_display
+   :project: Zephyr
diff --git a/doc/api/file_system.rst b/doc/api/file_system.rst
index 9a7597f..7f036cf 100644
--- a/doc/api/file_system.rst
+++ b/doc/api/file_system.rst
@@ -3,6 +3,11 @@
 File System APIs
 #####################
 
+
+.. comment
+   not documenting
+   .. doxygengroup:: file_system
+
 File System Functions
 *******************************
 
diff --git a/doc/api/io_interfaces.rst b/doc/api/io_interfaces.rst
index 59bc1b1..bd61d72 100644
--- a/doc/api/io_interfaces.rst
+++ b/doc/api/io_interfaces.rst
@@ -8,12 +8,22 @@
    :local:
    :backlinks: top
 
+.. comment
+   not documenting
+   .. doxygengroup:: io_interfaces
+
 ADC Interface
 *************
 
 .. doxygengroup:: adc_interface
    :project: Zephyr
 
+DMA Interface
+*************
+
+.. doxygengroup:: DMA_interface
+   :project: Zephyr
+
 GPIO Interface
 **************
 
@@ -72,8 +82,20 @@
 .. doxygengroup:: uart_interface
    :project: Zephyr
 
+Flash Interface
+***************
+
+.. doxygengroup:: flash_interface
+   :project: Zephyr
+
 Sensor Interface
 ****************
 
 .. doxygengroup:: sensor_interface
    :project: Zephyr
+
+Counter Interface
+*****************
+
+.. doxygengroup:: counter_interface
+   :project: Zephyr
diff --git a/doc/api/kernel_api.rst b/doc/api/kernel_api.rst
index 367e4b0..d1081f4 100644
--- a/doc/api/kernel_api.rst
+++ b/doc/api/kernel_api.rst
@@ -14,6 +14,10 @@
    :local:
    :backlinks: top
 
+.. comment
+   not documenting
+   .. doxygengroup:: kernel_apis
+
 Threads
 *******
 
@@ -145,6 +149,12 @@
 .. doxygengroup:: stack_apis
    :project: Zephyr
 
+Queues
+******
+
+.. doxygengroup:: queue_apis
+   :project: Zephyr
+
 Message Queues
 **************
 
@@ -175,6 +185,12 @@
 .. doxygengroup:: pipe_apis
    :project: Zephyr
 
+Asynchronous Polling
+********************
+
+.. doxygengroup:: poll_apis
+   :project: Zephyr
+
 Interrupt Service Routines (ISRs)
 *********************************
 
@@ -198,6 +214,12 @@
 .. doxygengroup:: atomic_apis
    :project: Zephyr
 
+Profiling
+*********
+
+.. doxygengroup:: profiling_apis
+   :project: Zephyr
+
 Floating Point Services
 ***********************
 
diff --git a/doc/api/misc_api.rst b/doc/api/misc_api.rst
new file mode 100644
index 0000000..b446b63
--- /dev/null
+++ b/doc/api/misc_api.rst
@@ -0,0 +1,27 @@
+.. _misc_api:
+
+Miscellaneous APIs
+##################
+
+.. comment
+   not documenting
+   .. doxygengroup:: checksum
+   .. doxygengroup:: structured_data
+
+Checksum APIs
+*************
+
+CRC16
+=====
+
+.. doxygengroup:: crc16
+   :project: Zephyr
+
+Structured Data APIs
+********************
+
+JSON
+====
+
+.. doxygengroup:: json
+   :project: Zephyr
diff --git a/doc/api/networking.rst b/doc/api/networking.rst
index 871714b..85194b5 100644
--- a/doc/api/networking.rst
+++ b/doc/api/networking.rst
@@ -13,6 +13,11 @@
 APIs will not be present if :option:`CONFIG_NET_IPV6` has not
 been selected.
 
+.. comment
+   not documenting
+   .. doxygengroup:: networking
+   .. doxygengroup:: arp
+
 Network core helpers
 ********************
 
@@ -97,6 +102,12 @@
 .. doxygengroup:: udp
    :project: Zephyr
 
+Hostname Configuration Library
+******************************
+
+.. doxygengroup:: net_hostname
+   :project: Zephyr
+
 Network technologies
 ********************