Update runtime files
diff --git a/runtime/doc/undo.txt b/runtime/doc/undo.txt
index 4a0ea04..23a30af 100644
--- a/runtime/doc/undo.txt
+++ b/runtime/doc/undo.txt
@@ -1,4 +1,4 @@
-*undo.txt* For Vim version 8.2. Last change: 2020 Nov 30
+*undo.txt* For Vim version 8.2. Last change: 2022 Jun 02
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -105,12 +105,16 @@
After this a "u" command will undo the delete command and the previous
change.
-
+ *undo-break*
To do the opposite, break a change into two undo blocks, in Insert mode use
CTRL-G u. This is useful if you want an insert command to be undoable in
parts. E.g., for each sentence. |i_CTRL-G_u|
+
Setting the value of 'undolevels' also breaks undo. Even when the new value
-is equal to the old value.
+is equal to the old value. In |Vim9| script: >
+ &undolevels = &undolevels
+In legacy script: >
+ let &undolevels = &undolevels
==============================================================================
4. Undo branches *undo-branches* *undo-tree*