docs: mention that GST_FORMAT_{PERCENT|BUFFERS} are not implemented
docs: mention that GST_FORMAT_{PERCENT|BUFFERS} are not implemented

collects/gstreamer,drothlis/gstreamer,lovebug356/gstreamer,mrchapp/gstreamer,lubosz/gstreamer,shelsonjava/gstreamer,drothlis/gstreamer,justinjoy/gstreamer,lovebug356/gstreamer,krieger-od/gstreamer,cablelabs/gstreamer,cablelabs/gstreamer,lubosz/gstreamer,Lachann/gstreamer,ahmedammar/platform_external_gst_gstreamer,StreamUtils/gstreamer,collects/gstreamer,mparis/gstreamer,cfoch/gstreamer,cfoch/gstreamer,surround-io/gstreamer,jpakkane/gstreamer,StreamUtils/gstreamer,lovebug356/gstreamer,krichter722/gstreamer,shelsonjava/gstreamer,ylatuya/gstreamer,mrchapp/gstreamer,ylatuya/gstreamer,ensonic/gstreamer,ylatuya/gstreamer,magcius/gstreamer,jpxiong/gstreamer,collects/gstreamer,Lachann/gstreamer,drothlis/gstreamer,jpakkane/gstreamer,Distrotech/gstreamer,ahmedammar/platform_external_gst_gstreamer,centricular/gstreamer,magcius/gstreamer,cablelabs/gstreamer,cfoch/gstreamer,lubosz/gstreamer,lubosz/gstreamer,Distrotech/gstreamer,krichter722/gstreamer,jpakkane/gstreamer,mparis/gstreamer,krichter722/gstreamer,Distrotech/gstreamer,jpxiong/gstreamer,mrchapp/gstreamer,Lachann/gstreamer,magcius/gstreamer,cfoch/gstreamer,shelsonjava/gstreamer,StreamUtils/gstreamer,jpxiong/gstreamer,ylatuya/gstreamer,krieger-od/gstreamer,justinjoy/gstreamer,ahmedammar/platform_external_gst_gstreamer,jpakkane/gstreamer,mrchapp/gstreamer,ensonic/gstreamer,jpxiong/gstreamer,surround-io/gstreamer,collects/gstreamer,centricular/gstreamer,shelsonjava/gstreamer,Distrotech/gstreamer,justinjoy/gstreamer,mparis/gstreamer,ensonic/gstreamer,jpxiong/gstreamer,cfoch/gstreamer,ensonic/gstreamer,centricular/gstreamer,jpakkane/gstreamer,surround-io/gstreamer,centricular/gstreamer,drothlis/gstreamer,mparis/gstreamer,ahmedammar/platform_external_gst_gstreamer,lovebug356/gstreamer,krichter722/gstreamer,mrchapp/gstreamer,justinjoy/gstreamer,lovebug356/gstreamer,collects/gstreamer,shelsonjava/gstreamer,drothlis/gstreamer,mparis/gstreamer,justinjoy/gstreamer,centricular/gstreamer,surround-io/gstreamer,magcius/gstreamer,ylatuya/gstreamer,surround-io/gstreamer,lubosz/gstreamer,krichter722/gstreamer,Lachann/gstreamer,Lachann/gstreamer,magcius/gstreamer,ahmedammar/platform_external_gst_gstreamer,ensonic/gstreamer,StreamUtils/gstreamer,krieger-od/gstreamer,krieger-od/gstreamer,StreamUtils/gstreamer,krieger-od/gstreamer,cablelabs/gstreamer,cablelabs/gstreamer,Distrotech/gstreamer