caps: add comments about g_ptr_array size behaviour
caps: add comments about g_ptr_array size behaviour

Just explain the behaviour to avoid that someone else is wasting time trying to
improve this too.

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