Update runtime files
diff --git a/runtime/doc/diff.txt b/runtime/doc/diff.txt
index 216922a..3caa7cf 100644
--- a/runtime/doc/diff.txt
+++ b/runtime/doc/diff.txt
@@ -1,4 +1,4 @@
-*diff.txt* For Vim version 9.0. Last change: 2023 Jan 21
+*diff.txt* For Vim version 9.0. Last change: 2023 Apr 04
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -109,6 +109,7 @@
accidentally being patched. But it may still result in
various ".rej" files to be created. And when absolute path
names are present these files may get patched anyway.
+ Using the "patch" command is not allowed in |restricted-mode|.
To make these commands use a vertical split, prepend |:vertical|. Examples: >