Documented gC mapping does not exist

[lilyball]

The documentation says

Force line-wise operation:
    gC{motion}   :: Toggle comments by line
    gC<Count>c{motion} :: Toggle comment by line with count argument 
                    (see |tcomment#Comment()|)

Unfortunately these maps don't actually exist. There's a <Plug>TComment_gC mapping, but not the actual gC one.