feature/pgtk: docstring correction

["Colin Woodbury" <colin@fosskers.ca>]

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Hi there, this patch targets the feature/pgtk branch. Please let me know if the patch is in the correct format, otherwise I'll resubmit.

Thanks!
Colin

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diff --git a/src/frame.c b/src/frame.c
index eb5aed82f7..0e74bb937f 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -225,7 +225,8 @@ Value is:
  `x' for an Emacs frame that is really an X window,
  `w32' for an Emacs frame that is a window on MS-Windows display,
  `ns' for an Emacs frame on a GNUstep or Macintosh Cocoa display,
- `pc' for a direct-write MS-DOS frame.
+ `pc' for a direct-write MS-DOS frame,
+ `pgtk' for an Emacs frame running entirely in GTK.
 See also `frame-live-p'.  */)
   (Lisp_Object object)
 {