Update runtime files.
diff --git a/runtime/doc/undo.txt b/runtime/doc/undo.txt
index 542b101..b1c6fa7 100644
--- a/runtime/doc/undo.txt
+++ b/runtime/doc/undo.txt
@@ -1,4 +1,4 @@
-*undo.txt* For Vim version 8.2. Last change: 2019 Dec 07
+*undo.txt* For Vim version 8.2. Last change: 2020 Oct 18
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -392,7 +392,7 @@
*redo-register*
If you want to get back more than one part of deleted text, you can use a
special feature of the repeat command ".". It will increase the number of the
-register used. So if you first do ""1P", the following "." will result in a
+register used. So if you first do '"1P', the following "." will result in a
'"2P'. Repeating this will result in all numbered registers being inserted.
Example: If you deleted text with 'dd....' it can be restored with