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/farsi.txt b/runtime/doc/farsi.txt
index 2729859..da47a0c 100644
--- a/runtime/doc/farsi.txt
+++ b/runtime/doc/farsi.txt
@@ -1,4 +1,4 @@
-*farsi.txt*     For Vim version 8.1.  Last change: 2019 Feb 16
+*farsi.txt*     For Vim version 8.1.  Last change: 2019 May 05
 
 
 		  VIM REFERENCE MANUAL    by Mortaza Ghassab Shiran
@@ -6,7 +6,6 @@
 
 Right to Left and Farsi Mapping for Vim		*farsi* *Farsi*
 
-{Vi does not have any of these commands}
 
 						*E27*
 Farsi support has been removed in patch 8.1.0932.  At that time it was