boards: stm32h750b_dk: update doc & board file

Update board's doc & yaml file with enabled features.

Signed-off-by: Abderrahmane Jarmouni <git@jarmouni.me>
diff --git a/boards/st/stm32h750b_dk/doc/index.rst b/boards/st/stm32h750b_dk/doc/index.rst
index d3fc2c2..a2b09e4 100644
--- a/boards/st/stm32h750b_dk/doc/index.rst
+++ b/boards/st/stm32h750b_dk/doc/index.rst
@@ -59,7 +59,14 @@
 +-----------+------------+-------------------------------------+
 | RTC       | on-chip    | rtc                                 |
 +-----------+------------+-------------------------------------+
-
+| ADC       | on-chip    | adc                                 |
++-----------+------------+-------------------------------------+
+| LTDC      | on-chip    | display                             |
++-----------+------------+-------------------------------------+
+| QSPI NOR  | on-chip    | off-chip flash                      |
++-----------+------------+-------------------------------------+
+| FMC       | on-chip    | memc (SDRAM)                        |
++-----------+------------+-------------------------------------+
 
 Other hardware features are not yet supported on Zephyr porting.
 
diff --git a/boards/st/stm32h750b_dk/stm32h750b_dk.yaml b/boards/st/stm32h750b_dk/stm32h750b_dk.yaml
index 2ef5ca1..da7d087 100644
--- a/boards/st/stm32h750b_dk/stm32h750b_dk.yaml
+++ b/boards/st/stm32h750b_dk/stm32h750b_dk.yaml
@@ -15,4 +15,6 @@
   - flash
   - rtc
   - memc
+  - display
+  - spi
 vendor: st