adapter: fix docs for 1.0
adapter: fix docs for 1.0

Add parent to chain function signature and use it.

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