ffplay: update docs after previous changes in ffplay mouse behaviour

Signed-off-by: Vittorio Gambaletta <ffmpeg-dev@vittgam.net>
Signed-off-by: Marton Balint <cus@passwd.hu>

doc/ffplay.texi

@@ -238,9 +238,12 @@ Seek to the previous/next chapter.
 or if there are no chapters
 Seek backward/forward 10 minutes.
 
-@item mouse click
+@item right mouse click
 Seek to percentage in file corresponding to fraction of width.
 
+@item left mouse double-click
+Toggle full screen.
+
 @end table
 
 @c man end

ffplay.c

@@ -3738,7 +3738,8 @@ void show_help_default(const char *opt, const char *arg)
            "left/right          seek backward/forward 10 seconds\n"
            "down/up             seek backward/forward 1 minute\n"
            "page down/page up   seek backward/forward 10 minutes\n"
-           "mouse click         seek to percentage in file corresponding to fraction of width\n"
+           "right mouse click   seek to percentage in file corresponding to fraction of width\n"
+           "left double-click   toggle full screen\n"
            );
 }