Update runtime files
diff --git a/runtime/doc/diff.txt b/runtime/doc/diff.txt
index 566411a..62201d4 100644
--- a/runtime/doc/diff.txt
+++ b/runtime/doc/diff.txt
@@ -1,4 +1,4 @@
-*diff.txt*      For Vim version 8.2.  Last change: 2019 Nov 10
+*diff.txt*      For Vim version 8.2.  Last change: 2021 Feb 10
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar