Update runtime files.
diff --git a/runtime/doc/index.txt b/runtime/doc/index.txt
index aec4ca0..e5d29ad 100644
--- a/runtime/doc/index.txt
+++ b/runtime/doc/index.txt
@@ -1,4 +1,4 @@
-*index.txt*     For Vim version 8.2.  Last change: 2020 Oct 05
+*index.txt*     For Vim version 8.2.  Last change: 2021 Jan 15
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar