doc: Add GstDevice* to gstreamer-sections.txt
doc: Add GstDevice* to gstreamer-sections.txt

https://bugzilla.gnome.org/show_bug.cgi?id=729440

StreamUtils/gstreamer,shelsonjava/gstreamer,surround-io/gstreamer,surround-io/gstreamer,krichter722/gstreamer,mparis/gstreamer,jpxiong/gstreamer,jpakkane/gstreamer,shelsonjava/gstreamer,Lachann/gstreamer,jpxiong/gstreamer,mparis/gstreamer,mparis/gstreamer,centricular/gstreamer,shelsonjava/gstreamer,jpxiong/gstreamer,surround-io/gstreamer,Lachann/gstreamer,jpxiong/gstreamer,jpakkane/gstreamer,mparis/gstreamer,shelsonjava/gstreamer,mparis/gstreamer,centricular/gstreamer,krichter722/gstreamer,jpakkane/gstreamer,surround-io/gstreamer,shelsonjava/gstreamer,surround-io/gstreamer,StreamUtils/gstreamer,Lachann/gstreamer,StreamUtils/gstreamer,krichter722/gstreamer,jpakkane/gstreamer,centricular/gstreamer,krichter722/gstreamer,jpxiong/gstreamer,centricular/gstreamer,centricular/gstreamer,StreamUtils/gstreamer,krichter722/gstreamer,Lachann/gstreamer,StreamUtils/gstreamer,Lachann/gstreamer,jpakkane/gstreamer