Revert "[nrf noup] doc: extensions: domain: skip patching doxygen groups"

This reverts commit a3c63a4.

Signed-off-by: Gerard Marull-Paretas <[email protected]>

Author: gmarull

doc/_extensions/zephyr/domain.py

@@ -339,7 +339,7 @@ def setup(app):
     app.add_post_transform(ProcessRelatedCodeSamplesNode)
 
     # monkey-patching of the DoxygenGroupDirective
-    # app.add_directive("doxygengroup", CustomDoxygenGroupDirective, override=True)
+    app.add_directive("doxygengroup", CustomDoxygenGroupDirective, override=True)
 
     return {
         "version": __version__,