pwg: improve allocation docs
pwg: improve allocation docs

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