Add new stuff to the gdk docs

Document all the things.

docs/reference/gdk/gdk4-docs.xml

@@ -40,6 +40,11 @@
     <xi:include href="xml/event_structs.xml" />
     <xi:include href="xml/keys.xml" />
     <xi:include href="xml/selections.xml" />
+    <xi:include href="xml/gdkcontentformats.xml" />
+    <xi:include href="xml/gdkcontentprovider.xml" />
+    <xi:include href="xml/gdkcontentserializer.xml" />
+    <xi:include href="xml/gdkcontentdeserializer.xml" />
+    <xi:include href="xml/gdkclipboard.xml" />
     <xi:include href="xml/dnd.xml" />
     <xi:include href="xml/properties.xml" />
     <xi:include href="xml/threads.xml" />

docs/reference/gdk/gdk4-sections.txt

@@ -386,6 +386,12 @@ gdk_content_formats_match_mime_types
 gdk_content_formats_contain_gtype
 gdk_content_formats_contain_mime_type
 
+<SUBSECTION>
+gdk_content_formats_union_serialize_gtypes
+gdk_content_formats_union_deserialize_gtypes
+gdk_content_formats_union_serialize_mime_types
+gdk_content_formats_union_deserialize_mime_types
+
 <SUBSECTION>
 GdkContentFormatsBuilder
 gdk_content_formats_builder_new
@@ -1281,3 +1287,102 @@ gdk_vulkan_context_get_type
 gdk_vulkan_error_quark
 gdk_vulkan_strerror
 </SECTION>
+
+<SECTION>
+<FILE>gdkclipboard</FILE>
+GdkClipboard
+gdk_clipboard_get_display
+gdk_clipboard_get_formats
+gdk_clipboard_is_local
+gdk_clipboard_get_content
+gdk_clipboard_store_async
+gdk_clipboard_store_finish
+gdk_clipboard_read_async
+gdk_clipboard_read_finish
+gdk_clipboard_read_value_async
+gdk_clipboard_read_value_finish
+gdk_clipboard_read_texture_async
+gdk_clipboard_read_texture_finish
+gdk_clipboard_read_text_async
+gdk_clipboard_read_text_finish
+gdk_clipboard_set_content
+gdk_clipboard_set_text
+gdk_clipboard_set_texture
+
+<SUBSECTION Standard>
+GDK_TYPE_CLIPBOARD
+GDK_CLIPBOARD
+GDK_IS_CLIPBOARD
+gdk_clipboard_get_type
+</SECTION>
+
+<SECTION>
+<FILE>gdkcontentprovider</FILE>
+GdkContentProvider
+gdk_content_provider_new_for_value
+gdk_content_provider_new_for_bytes
+gdk_content_provider_ref_formats
+gdk_content_provider_ref_storable_formats
+gdk_content_provider_content_changed
+gdk_content_provider_write_mime_type_async
+gdk_content_provider_write_mime_type_finish
+gdk_content_provider_get_value
+
+<SUBSECTION Standard>
+gdk_content_provider_get_type
+</SECTION>
+
+<SECTION>
+<FILE>gdkcontentserializer</FILE>
+GdkContentSerializer
+GdkContentSerializeFunc
+gdk_content_serializer_get_mime_type
+gdk_content_serializer_get_gtype
+gdk_content_serializer_get_value
+gdk_content_serializer_get_output_stream
+gdk_content_serializer_get_priority
+gdk_content_serializer_get_cancellable
+gdk_content_serializer_get_user_data
+gdk_content_serializer_set_task_data
+gdk_content_serializer_get_task_data
+gdk_content_serializer_return_success
+gdk_content_serializer_return_error
+
+<SUBSECTION>
+gdk_content_register_serializer
+gdk_content_serialize_async
+gdk_content_serialize_finish
+
+<SUBSECTION Standard>
+GDK_TYPE_CONTENT_SERIALIZER
+GDK_CONTENT_SERIALIZER
+GDK_IS_CONTENT_SERIALIZER
+</SECTION>
+
+<SECTION>
+<FILE>gdkcontentdeserializer</FILE>
+GdkContentDeserializer
+GdkContentDeserializeFunc
+gdk_content_deserializer_get_mime_type
+gdk_content_deserializer_get_gtype
+gdk_content_deserializer_get_value
+gdk_content_deserializer_get_input_stream
+gdk_content_deserializer_get_priority
+gdk_content_deserializer_get_cancellable
+gdk_content_deserializer_get_user_data
+gdk_content_deserializer_set_task_data
+gdk_content_deserializer_get_task_data
+gdk_content_deserializer_return_success
+gdk_content_deserializer_return_error
+
+<SUBSECTION>
+gdk_content_register_deserializer
+gdk_content_deserialize_async
+gdk_content_deserialize_finish
+
+<SUBSECTION Standard>
+GDK_TYPE_CONTENT_DESERIALIZER
+GDK_CONTENT_DESERIALIZER
+GDK_IS_CONTENT_DESERIALIZER
+gdk_content_deserializer_get_type
+</SECTION>

docs/reference/gdk/gdk4.types

@@ -12,3 +12,7 @@ gdk_keymap_get_type
 gdk_monitor_get_type
 gdk_seat_get_type
 gdk_window_get_type
+gdk_content_serializer_get_type
+gdk_content_deserializer_get_type
+gdk_clipboard_get_type
+gdk_content_formats_get_type