docs: small clarification in the gst_element_get_request_pad docs
docs: small clarification in the gst_element_get_request_pad docs

Make it more obvious that one should pass the template name.

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