patch 8.2.3236: mode() does not indicate using CTRL-O in Select mode

Problem:    mode() does not indicate using CTRL-O in Select mode.
Solution:   Use "vs" and similar. (closes #8640)
diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index d5f5e8d..d99c398 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -7978,6 +7978,10 @@
 		   s	    Select by character
 		   S	    Select by line
 		   CTRL-S   Select blockwise
+		   vs	    Visual by character using |v_CTRL-O| from
+				Select mode
+		   Vs	    Visual by line using |v_CTRL-O| from Select mode
+		   CTRL-Vs  Visual blockwise using |v_CTRL-O| from Select mode
 		   i	    Insert
 		   ic	    Insert mode completion |compl-generic|
 		   ix	    Insert mode |i_CTRL-X| completion