tee: fix property description for now-unused "alloc-pad" property
tee: fix property description for now-unused "alloc-pad" property

Should probably proxy ALLOCATION queries on that though, if set.
But what else? CAPS and ACCEPT_CAPS too?

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