Update runtime files.
diff --git a/runtime/doc/usr_31.txt b/runtime/doc/usr_31.txt
index 13de489..ac561a0 100644
--- a/runtime/doc/usr_31.txt
+++ b/runtime/doc/usr_31.txt
@@ -269,4 +269,4 @@
 
 Next chapter: |usr_32.txt|  The undo tree
 
-Copyright: see |manual-copyright|  vim:tw=78:ts=8:ft=help:norl:
+Copyright: see |manual-copyright|  vim:tw=78:ts=8:noet:ft=help:norl: