docs: fix broken doxygen references and escape HTML tags

- modules.dox: remove references to non-existent sendspin modules
- access.dox: remove reference to deprecated pipewire-media-session
- dma-buf.dox: fix \ref EnumFormat to \ref SPA_PARAM_EnumFormat,
  fix \ref struct to struct \ref for spa_meta_sync_timeline
- pipewire.conf.5.md: add explicit {#synopsis} anchor for internal links
- pipewire-client.conf.5.md: fix audio_converter to audio_adapter ref
- pipewire-jack.conf.5.md: escape <id> HTML tags
- pipewire-props.7.md: fix monitor-prop__ to props__ for card profiles ref
- pipewire-pulse.1.md: fix pipewire-env ref to full anchor name
- pipewire.1.md: fix \ref CPU to \ref spa_cpu

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/modules/meson.build

@@ -45,6 +45,8 @@ module_sources = [
   'module-snapcast-discover.c',
   'module-vban-recv.c',
   'module-vban-send.c',
+  'module-sendspin-recv.c',
+  'module-sendspin-send.c',
   'module-session-manager.c',
   'module-scheduler-v1.c',
   'module-zeroconf-discover.c',