Update runtime files.
diff --git a/runtime/doc/usr_20.txt b/runtime/doc/usr_20.txt
index afeb713..53c4b08 100644
--- a/runtime/doc/usr_20.txt
+++ b/runtime/doc/usr_20.txt
@@ -381,4 +381,4 @@
 
 Next chapter: |usr_21.txt|  Go away and come back
 
-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: