feature/pgtk 67a4c8b: * src/frame.c (Fframep): Update framep docstring

[Yuuki Harano]

branch: feature/pgtk
commit 67a4c8b5ad9ebfb3fa2c7fae433aa6b6b5e92154
Author: Colin Woodbury <colin@fosskers.ca>
Commit: Yuuki Harano <masm+github@masm11.me>

    * src/frame.c (Fframep): Update framep docstring
---
 src/frame.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/frame.c b/src/frame.c
index 40b8d2b..f8479f6 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)
 {