help for textcolor and linecolor

[Petr M. <mi...@ph...>]

The following command set colour of line and text

  plot x with line linecolor 3
  set label 1 "HELLO" at 1,0 textcolor lt 3

but it seems they are not documented in
  help textcolor
which is the same as
  help linecolor

I think this change would be sufficient:

 Syntax:

       ... {linecolor | lc} {<colorspec> | <n>}
       ... {textcolor | tc} {<colorspec> | lt <n>}


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PM