docs: remove GstProxyPad from private section
docs: remove GstProxyPad from private section

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