doc: Add missing gst_event_new/parse_protection
doc: Add missing gst_event_new/parse_protection

jpxiong/gstreamer,krichter722/gstreamer,krichter722/gstreamer,krichter722/gstreamer,jpxiong/gstreamer,shelsonjava/gstreamer,krichter722/gstreamer,shelsonjava/gstreamer,StreamUtils/gstreamer,krichter722/gstreamer,shelsonjava/gstreamer,StreamUtils/gstreamer,centricular/gstreamer,jpxiong/gstreamer,centricular/gstreamer,shelsonjava/gstreamer,StreamUtils/gstreamer,jpxiong/gstreamer,StreamUtils/gstreamer,centricular/gstreamer,centricular/gstreamer,jpxiong/gstreamer,shelsonjava/gstreamer,centricular/gstreamer,StreamUtils/gstreamer