docs: fix typo in bus docs
docs: fix typo in bus docs

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