Runtime file updates.
diff --git a/runtime/doc/undo.txt b/runtime/doc/undo.txt
index 92553ab..373f513 100644
--- a/runtime/doc/undo.txt
+++ b/runtime/doc/undo.txt
@@ -1,4 +1,4 @@
-*undo.txt* For Vim version 8.1. Last change: 2019 May 07
+*undo.txt* For Vim version 8.1. Last change: 2019 Dec 07
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -271,7 +271,7 @@
(the magic number at the start of the file is wrong), then
this fails, unless the ! was added.
If it exists and does look like an undo file it is
- overwritten. If there is no undo-history, nothing will be
+ overwritten. If there is no undo-history, nothing will be
written.
Implementation detail: Overwriting happens by first deleting
the existing file and then creating a new file with the same