docs: remove non existing symbol
docs: remove non existing symbol

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