[issue25199] Idle: add cross-references from and to macosxSupport

[Terry J. Reedy]

New submission from Terry J. Reedy:

After changing EditorWindow.EditorWindow.help_dialog for #16893, I forgot, until remined by Mark, to make the corresponding change in macosxSupport.<override-menu>.help_dialog.  After doing so, I added to the former file
    # edit maxosxSupport.overrideRootMenu.help_dialog to match
This issue is to put a revised message
   # Synchronize with <module.class.funcname>.
in each member of all pairs that need to by synchronized.  There are at least two others,

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25199>
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