patch 8.2.2518: 'listchars' should be window-local

Problem:    'listchars' should be window-local.
Solution:   Make 'listchars' global-local. (Yegappan Lakshmanan, Marco Hinz,
            closes #5206, closes #7850)
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 08d205c..d5264ec 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -4854,7 +4854,7 @@
 
 						*'listchars'* *'lcs'*
 'listchars' 'lcs'	string	(default "eol:$")
-			global
+			global or local to window |global-local|
 	Strings to use in 'list' mode and for the |:list| command.  It is a
 	comma separated list of string settings.
 							*lcs-eol*