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/rileft.txt b/runtime/doc/rileft.txt
index f5ec8e8..2060283 100644
--- a/runtime/doc/rileft.txt
+++ b/runtime/doc/rileft.txt
@@ -1,4 +1,4 @@
-*rileft.txt*    For Vim version 8.1.  Last change: 2006 Apr 24
+*rileft.txt*    For Vim version 8.1.  Last change: 2019 May 05
 
 
 		  VIM REFERENCE MANUAL    by Avner Lottem
@@ -12,8 +12,6 @@
    E-mail: alottem@iil.intel.com
    Phone:  +972-4-8307322
 
-{Vi does not have any of these commands}
-
 								*E26*
 {only available when compiled with the |+rightleft| feature}