Clarify visibility documentation

mastodon/Mastodon.py

@@ -526,7 +526,9 @@ class Mastodon:
         'public' - post will be public
 
         If not passed in, visibility defaults to match the current account's
-        privacy setting (private if the account is locked, public otherwise).
+        locked setting (private if the account is locked, public otherwise).
+        Note that the "privacy" setting is not currently used in determining
+        visibility when not specified.
 
         The spoiler_text parameter is a string to be shown as a warning before
         the text of the status.  If no text is passed in, no warning will be