samples: Using zephyr:code-samples for smbus and edac

Using zephyr:code-sample:: for SMBus and EDAC samples docs.

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
diff --git a/samples/drivers/smbus/README.rst b/samples/drivers/smbus/README.rst
index 9a35ca1..31a753c 100644
--- a/samples/drivers/smbus/README.rst
+++ b/samples/drivers/smbus/README.rst
@@ -1,7 +1,8 @@
-.. _samples_smbus_shell:
+.. zephyr:code-sample:: smbus-shell
+   :name: SMBus shell
+   :relevant-api: smbus_interface
 
-SMBus Shell Sample
-##################
+   SMBus Shell Sample
 
 Overview
 ********
diff --git a/samples/subsys/edac/README.rst b/samples/subsys/edac/README.rst
index 13647e9..bcac44d 100644
--- a/samples/subsys/edac/README.rst
+++ b/samples/subsys/edac/README.rst
@@ -1,7 +1,8 @@
-.. _samples_edac:
+.. zephyr:code-sample:: edac-sample
+   :name: EDAC shell
+   :relevant-api: edac
 
-EDAC Shell Sample
-#################
+   EDAC Shell Sample
 
 Overview
 ********