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/if_cscop.txt b/runtime/doc/if_cscop.txt
index ba0f1d5..ed00a85 100644
--- a/runtime/doc/if_cscop.txt
+++ b/runtime/doc/if_cscop.txt
@@ -1,4 +1,4 @@
-*if_cscop.txt*  For Vim version 8.1.  Last change: 2018 Jan 21
+*if_cscop.txt*  For Vim version 8.1.  Last change: 2019 May 05
 
 
 		  VIM REFERENCE MANUAL    by Andy Kahn
@@ -21,7 +21,6 @@
 7. Availability & Information	|cscope-info|
 
 This is currently for Unix and Win32 only.
-{Vi does not have any of these commands}
 
 ==============================================================================
 1. Cscope introduction					*cscope-intro*