media: doc: Add media-request.h header to documentation build

media-request.h has been recently added; add it to the documentation build
as well.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Documentation/media/kapi/mc-core.rst

@@ -262,3 +262,5 @@ in the end provide a way to use driver-specific callbacks.
 .. kernel-doc:: include/media/media-devnode.h
 
 .. kernel-doc:: include/media/media-entity.h
+
+.. kernel-doc:: include/media/media-request.h