Update runtime files
diff --git a/runtime/doc/usr_40.txt b/runtime/doc/usr_40.txt
index 21c09b4..9ed777f 100644
--- a/runtime/doc/usr_40.txt
+++ b/runtime/doc/usr_40.txt
@@ -1,4 +1,4 @@
-*usr_40.txt* For Vim version 8.2. Last change: 2020 Sep 02
+*usr_40.txt* For Vim version 8.2. Last change: 2022 Jan 03
VIM USER MANUAL - by Bram Moolenaar
@@ -20,7 +20,7 @@
==============================================================================
*40.1* Key mapping
-A simple mapping was explained in section |05.3|. The principle is that one
+A simple mapping was explained in section |05.4|. The principle is that one
sequence of key strokes is translated into another sequence of key strokes.
This is a simple, yet powerful mechanism.
The simplest form is that one key is mapped to a sequence of keys. Since