docs: flesh our 'Running GStreamer' bits a bit
docs: flesh our 'Running GStreamer' bits a bit

https://bugzilla.gnome.org/show_bug.cgi?id=693607

krichter722/gstreamer,ensonic/gstreamer,collects/gstreamer,krichter722/gstreamer,mparis/gstreamer,cablelabs/gstreamer,centricular/gstreamer,surround-io/gstreamer,mparis/gstreamer,lubosz/gstreamer,krieger-od/gstreamer,surround-io/gstreamer,lubosz/gstreamer,StreamUtils/gstreamer,cablelabs/gstreamer,cfoch/gstreamer,Lachann/gstreamer,shelsonjava/gstreamer,collects/gstreamer,lovebug356/gstreamer,collects/gstreamer,ensonic/gstreamer,centricular/gstreamer,lovebug356/gstreamer,jpakkane/gstreamer,Lachann/gstreamer,Lachann/gstreamer,cfoch/gstreamer,cfoch/gstreamer,surround-io/gstreamer,jpakkane/gstreamer,jpxiong/gstreamer,shelsonjava/gstreamer,ensonic/gstreamer,shelsonjava/gstreamer,justinjoy/gstreamer,StreamUtils/gstreamer,cfoch/gstreamer,shelsonjava/gstreamer,jpxiong/gstreamer,mparis/gstreamer,krieger-od/gstreamer,lubosz/gstreamer,jpxiong/gstreamer,justinjoy/gstreamer,justinjoy/gstreamer,collects/gstreamer,krichter722/gstreamer,mparis/gstreamer,surround-io/gstreamer,lubosz/gstreamer,centricular/gstreamer,StreamUtils/gstreamer,jpxiong/gstreamer,jpakkane/gstreamer,justinjoy/gstreamer,lovebug356/gstreamer,cablelabs/gstreamer,cablelabs/gstreamer,jpxiong/gstreamer,lovebug356/gstreamer,krieger-od/gstreamer,cfoch/gstreamer,Lachann/gstreamer,jpakkane/gstreamer,centricular/gstreamer,lovebug356/gstreamer,krieger-od/gstreamer,krieger-od/gstreamer,cablelabs/gstreamer,StreamUtils/gstreamer,shelsonjava/gstreamer,krichter722/gstreamer,StreamUtils/gstreamer,ensonic/gstreamer,lubosz/gstreamer,mparis/gstreamer,krichter722/gstreamer,jpakkane/gstreamer,centricular/gstreamer,surround-io/gstreamer,ensonic/gstreamer,Lachann/gstreamer,collects/gstreamer,justinjoy/gstreamer