runtime(doc): add reference to xterm-focus-event from FocusGained/Lost

fixes: #15157

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/autocmd.txt b/runtime/doc/autocmd.txt
index e19d601..34e9535 100644
--- a/runtime/doc/autocmd.txt
+++ b/runtime/doc/autocmd.txt
@@ -1,4 +1,4 @@
-*autocmd.txt*   For Vim version 9.1.  Last change: 2024 Jun 21
+*autocmd.txt*   For Vim version 9.1.  Last change: 2024 Jul 06
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -915,12 +915,12 @@
 							*FocusGained*
 FocusGained			When Vim got input focus.  Only for the GUI
 				version and a few console versions where this
-				can be detected.
+				can be detected. |xterm-focus-event|
 							*FocusLost*
 FocusLost			When Vim lost input focus.  Only for the GUI
 				version and a few console versions where this
-				can be detected.  May also happen when a
-				dialog pops up.
+				can be detected. |xterm-focus-event|
+				May also happen when a dialog pops up.
 							*FuncUndefined*
 FuncUndefined			When a user function is used but it isn't
 				defined.  Useful for defining a function only