Update runtime files.
diff --git a/runtime/doc/usr_28.txt b/runtime/doc/usr_28.txt
index e2565b0..9e18c5c 100644
--- a/runtime/doc/usr_28.txt
+++ b/runtime/doc/usr_28.txt
@@ -423,4 +423,4 @@
 
 Next chapter: |usr_29.txt|  Moving through programs
 
-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: