porting: update doc
porting: update doc

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