Update runtime files.
diff --git a/runtime/doc/editing.txt b/runtime/doc/editing.txt
index 04bf4b1..1fc1c2f 100644
--- a/runtime/doc/editing.txt
+++ b/runtime/doc/editing.txt
@@ -1,4 +1,4 @@
-*editing.txt* For Vim version 8.1. Last change: 2018 Mar 29
+*editing.txt* For Vim version 8.1. Last change: 2018 Dec 16
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -1415,7 +1415,7 @@
The text in the swap file and the undo file is also encrypted. *E843*
However, this is done block-by-block and may reduce the time needed to crack a
password. You can disable the swap file, but then a crash will cause you to
-lose your work. The undo file can be disabled without much disadvantage. >
+lose your work. The undo file can be disabled without too much disadvantage. >
:set noundofile
:noswapfile edit secrets