Add documentation for LV2 element.

ext/lv2/gstlv2.c

@@ -19,6 +19,19 @@
  * Boston, MA 02111-1307, USA.
  */
 
+/**
+ * SECTION:element-lv2
+ * @short_description: bridge for LV2.
+ *
+ * LV2 is a standard for plugins and matching host applications,
+ * mainly targeted at audio processing and generation.  It is intended as
+ * a successor to LADSPA (Linux Audio Developer's Simple Plugin API).
+ *
+ * The LV2 element is a bridge for plugins using the
+ * <ulink url="http://www.lv2plug.in/">LV2</ulink> API.  It scans all
+ * installed LV2 plugins and registers them as gstreamer elements.
+ */
+
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif