doc: reorganize some \pages, and fix some group names

Move \pages having to do with the API usage to the API section.
Better group names for some groups.

doc/api-tree.dox

@@ -4,6 +4,7 @@
 \brief PipeWire Core API
 \{
 \addtogroup pw_pipewire
+\addtogroup pw_main_loop
 \addtogroup pw_context
 \addtogroup pw_client
 \addtogroup pw_core
@@ -50,7 +51,6 @@
 \addtogroup pw_conf
 \addtogroup pw_gettext
 \addtogroup pw_log
-\addtogroup pw_main_loop
 \addtogroup pw_map
 \addtogroup pw_memblock
 \addtogroup pw_properties
@@ -66,9 +66,6 @@
 \addtogroup pw_profiler
 \addtogroup pw_protocol_native
 \addtogroup pw_session_manager
-\{
-\addtogroup pw_session_manager_impl
-\}
 \}
 
 \defgroup api_spa SPA
@@ -112,11 +109,11 @@
 \}
 \}
 
-\defgroup pw_stream Stream API
+\defgroup pw_stream Stream
 \{
 \}
 
-\defgroup pw_filter Filter API
+\defgroup pw_filter Filter
 \{
 \}
 

doc/api.dox

@@ -59,8 +59,10 @@ digraph API {
 It is common for clients to use both the \ref api_pw_core and the \ref api_pw_impl
 and both APIs are provided by the same library.
 
-
-
+- \subpage page_client_impl
+- \subpage page_proxy
+- \subpage page_streams
+- \subpage page_thread_loop
 
 
 \addtogroup api_pw_core Core API

doc/pipewire-audio.dox

@@ -1,4 +1,4 @@
-/** \page page_audio PipeWire Audio
+/** \page page_audio Audio
 
 This document explains how Audio is implemented.
 

doc/pipewire-objects-design.dox

@@ -1,4 +1,4 @@
-/** \page page_objects_design PipeWire Objects Design
+/** \page page_objects_design Objects Design
 
 This document is a design reference on the various objects that exist
 in the PipeWire media and session management graphs, explaining what these

doc/pipewire.dox

@@ -1,4 +1,4 @@
-/** \page page_pipewire PipeWire
+/** \page page_pipewire PipeWire Design
 
 ## Internals
 
@@ -7,20 +7,15 @@
 - \subpage page_access
 - \subpage page_portal
 - \subpage page_midi
-- \subpage page_streams
-- \subpage page_client
-- \subpage page_proxy
-- \subpage page_thread_loop
 - \subpage page_objects_design
+- \subpage page_library
 - \subpage page_dma_buf
 
 ## Components
 
 - \subpage page_daemon
-- \subpage page_library
 - \subpage page_tools
 - \subpage page_session_manager
-- \ref page_spa
 
 ## Backends