docs: a random set of trivial fixes for the library docs

All those where super straight forward from the warnings gtkdoc prints. It kind
of makes sense to apply them before the list of warnings is >100 and people
complain that gtkdoc is noisy.

docs/libs/gst-plugins-base-libs-sections.txt

@@ -5,10 +5,10 @@
 <TITLE>dmabuf</TITLE>
 <INCLUDE>gst/allocators/gstdmabuf.h</INCLUDE>
 gst_dmabuf_allocator_alloc
-gst_dmabuf_allocator_obtain
 gst_dmabuf_memory_get_fd
 gst_is_dmabuf_memory
 <SUBSECTION Standard>
+GST_ALLOCATOR_DMABUF
 <SUBSECTION Private>
 </SECTION>
 
@@ -141,7 +141,6 @@ GST_AUDIO_INFO_CHANNELS
 GST_AUDIO_INFO_DEPTH
 GST_AUDIO_INFO_FLAGS
 GST_AUDIO_INFO_FORMAT
-GST_AUDIO_INFO_HAS_DEFAULT_POSITIONS
 GST_AUDIO_INFO_NAME
 GST_AUDIO_INFO_POSITION
 GST_AUDIO_INFO_RATE
@@ -300,7 +299,6 @@ GST_AUDIO_DECODER_CAST
 <INCLUDE>gst/audio/gstaudioencoder.h</INCLUDE>
 GstAudioEncoder
 GstAudioEncoderClass
-GST_AUDIO_ENCODER_SEGMENT
 GST_AUDIO_ENCODER_SINK_NAME
 GST_AUDIO_ENCODER_SINK_PAD
 GST_AUDIO_ENCODER_SRC_NAME
@@ -1433,7 +1431,6 @@ gst_rtsp_lower_trans_get_type
 <INCLUDE>gst/rtsp/gstrtspconnection.h</INCLUDE>
 GstRTSPConnection
 gst_rtsp_connection_create
-gst_rtsp_connection_create_from_fd
 gst_rtsp_connection_create_from_socket
 gst_rtsp_connection_accept
 gst_rtsp_connection_connect
@@ -1469,8 +1466,6 @@ gst_rtsp_connection_is_tunneled
 gst_rtsp_connection_get_tunnelid
 gst_rtsp_connection_do_tunnel
 
-gst_rtsp_connection_get_readfd
-gst_rtsp_connection_get_writefd
 gst_rtsp_connection_set_http_mode
 gst_rtsp_connection_set_proxy
 
@@ -1845,7 +1840,6 @@ GST_TAG_CDDA_CDDB_DISCID
 GST_TAG_CDDA_CDDB_DISCID_FULL
 GST_TAG_CDDA_MUSICBRAINZ_DISCID
 GST_TAG_CDDA_MUSICBRAINZ_DISCID_FULL
-GST_TAG_CDDA_TRACK_TAGS
 GST_TAG_CMML_CLIP
 GST_TAG_CMML_HEAD
 GST_TAG_CMML_STREAM
@@ -2131,7 +2125,6 @@ gst_encoding_profile_from_discoverer
 gst_encoding_profile_get_name
 gst_encoding_profile_get_description
 gst_encoding_profile_get_format
-gst_encoding_profile_get_allow_renegotiation
 gst_encoding_profile_get_preset
 gst_encoding_profile_get_preset_name
 gst_encoding_profile_get_presence
@@ -2140,7 +2133,6 @@ gst_encoding_profile_get_file_extension
 gst_encoding_profile_set_name
 gst_encoding_profile_set_description
 gst_encoding_profile_set_format
-gst_encoding_profile_set_allow_renegotiation
 gst_encoding_profile_set_preset
 gst_encoding_profile_set_preset_name
 gst_encoding_profile_set_restriction
@@ -2711,7 +2703,6 @@ gst_video_encoder_set_output_state
 gst_video_encoder_get_output_state
 gst_video_encoder_proxy_getcaps
 gst_video_encoder_merge_tags
-gst_video_encoder_get_allocator
 <SUBSECTION Standard>
 GST_IS_VIDEO_ENCODER
 GST_IS_VIDEO_ENCODER_CLASS

gst-libs/gst/allocators/gstfdmemory.h

@@ -39,6 +39,8 @@ typedef struct _GstFdAllocatorClass GstFdAllocatorClass;
 #define GST_FD_ALLOCATOR_CAST(obj)         ((GstFdAllocator *)(obj))
 
 /**
+ * GstFdMemoryFlags:
+ *
  * @GST_FD_MEMORY_FLAG_NONE: no flag
  * @GST_FD_MEMORY_FLAG_KEEP_MAPPED: once the memory is mapped,
  *        keep it mapped until the memory is destroyed.

gst-libs/gst/video/colorbalance.h

@@ -60,7 +60,7 @@ typedef enum
 /**
  * GstColorBalanceInterface:
  * @iface: the parent interface
- * @balance_type: implementation type
+ * @get_balance_type: implementation type
  * @list_channels: list handled channels
  * @set_value: set a channel value
  * @get_value: get a channel value

gst-libs/gst/video/video-scaler.c

@@ -1072,7 +1072,7 @@ get_y_offset (GstVideoFormat format)
  * gst_video_scaler_combine_packed_YUV:
  * @y_scale: a scaler for the Y component
  * @uv_scale: a scaler for the U and V components
- * @format: the video format
+ * @out_format: the video format
  *
  * Combine a scaler for Y and UV into one scaler for the packed @format.
  *