Correct incorrect reference to OSX Menu bar

This fixes https://github.com/owncloud/documentation/issues/4109.

doc/navigating.rst

@@ -5,7 +5,7 @@ Using the Synchronization Client
 .. index:: navigating, usage
 
 The Nextcloud Desktop Client remains in the background and is visible as an icon
-in the system tray (Windows, KDE), status bar (macOS), or notification area
+in the system tray (Windows, KDE), menu bar (Mac OS X), or notification area
 (Linux).
 
 .. figure:: images/icon.png