patch 8.1.1280: remarks about functionality not in Vi clutters the help

Problem:    Remarks about functionality not in Vi clutters the help.
Solution:   Move all info about what is new in Vim or already existed in Vi to
            vi_diff.txt.  Remove {not in Vi} remarks. (closes #4268) Add
            "noet" to the help files modeline.  Also include many other help
            file improvements.
diff --git a/runtime/doc/usr_22.txt b/runtime/doc/usr_22.txt
index e50237a..b3da19c 100644
--- a/runtime/doc/usr_22.txt
+++ b/runtime/doc/usr_22.txt
@@ -1,4 +1,4 @@
-*usr_22.txt*	For Vim version 8.1.  Last change: 2016 Dec 13
+*usr_22.txt*	For Vim version 8.1.  Last change: 2019 Apr 27
 
 		     VIM USER MANUAL - by Bram Moolenaar