master 3eb47077d3: Clarify doc of `x-display-set-last-user-time'

[Po Lu]

branch: master
commit 3eb47077d3d9e9e90ac7b9644d13c0da26c3ede8
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    Clarify doc of `x-display-set-last-user-time'
    
    * src/xfns.c (Fx_display_last_user_time): Explain in more detail
    the meaning of TERMINAL.
---
 src/xfns.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/xfns.c b/src/xfns.c
index 595f3fffff..3df91679af 100644
--- a/src/xfns.c
+++ b/src/xfns.c
@@ -9478,7 +9478,10 @@ DEFUN ("x-display-set-last-user-time", 
Fx_display_last_user_time,
 TIME-OBJECT is the X server time, in milliseconds, of the last user
 interaction.  This is the timestamp that `x-get-selection-internal'
 will use by default to fetch selection data.
-TERMINAL is the terminal on which the user interaction occurred.  */)
+The optional second argument TERMINAL specifies which display to act
+on.  TERMINAL should be a terminal object, a frame or a display name
+(a string).  If TERMINAL is omitted or nil, that stands for the
+selected frame's display.  */)
   (Lisp_Object time_object, Lisp_Object terminal)
 {
   struct x_display_info *dpyinfo;