docs: add streamsynchronizer to documentation

docs/plugins/gst-plugins-base-plugins-docs.sgml

@@ -41,6 +41,7 @@
     <xi:include href="xml/element-oggmux.xml" />
     <xi:include href="xml/element-playbin.xml" />
     <xi:include href="xml/element-playsink.xml" />
+    <xi:include href="xml/element-streamsynchronizer.xml" />
     <xi:include href="xml/element-subtitleoverlay.xml" />
     <xi:include href="xml/element-tcpclientsrc.xml" />
     <xi:include href="xml/element-tcpclientsink.xml" />

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

@@ -485,6 +485,21 @@ gst_play_sink_reconfigure
 gst_play_sink_plugin_init
 </SECTION>
 
+<SECTION>
+<FILE>element-streamsynchronizer</FILE>
+<TITLE>streamsynchronizer</TITLE>
+GstStreamSynchronizer
+<SUBSECTION Standard>
+GST_TYPE_STREAM_SYNCHRONIZER
+GST_STREAM_SYNCHRONIZER
+GST_STREAM_SYNCHRONIZER_CLASS
+GST_IS_STREAM_SYNCHRONIZER
+GST_IS_STREAM_SYNCHRONIZER_CLASS
+GstStreamSynchronizerClass
+gst_stream_synchronizer_get_type
+gst_stream_synchronizer_plugin_init
+</SECTION>
+
 <SECTION>
 <FILE>element-subtitleoverlay</FILE>
 <TITLE>subtitleoverlay</TITLE>