doc: add a media-session header file with the access-flatpak module

This adds a new top-level documentation entry for pipewire-media-session
with a list of modules (currently only one). Similar setup to the
pipewire modules, it allows us to document all modules in-place.

doc/media-session.dox

@@ -0,0 +1,15 @@
+/**
+
+\page page_media_session Media Session
+
+PipeWire Media Session is the reference/example session manager provided by
+the PipeWire project.
+
+# Modules
+
+List of Media Session modules:
+
+- \subpage page_media_session_module_access_flatpak
+
+
+*/

doc/meson.build

@@ -22,6 +22,9 @@ endforeach
 foreach h : module_sources
   inputs += meson.source_root() / 'src' / 'modules' / h
 endforeach
+foreach h : media_session_sources
+  inputs += meson.source_root() / 'src' / 'examples' / h
+endforeach
 inputs += meson.source_root() / 'test' / 'pwtest.h'
 
 # SPA headers use static inline functions. Doxygen doesn't extract those
@@ -64,6 +67,7 @@ extra_docs = [
   'pipewire-session-manager.dox',
   'pipewire-objects-design.dox',
   'pipewire-audio.dox',
+  'media-session.dox',
   'api.dox',
   'tutorial.dox',
   'tutorial1.dox',