[docs] [issue27563] docs for `gc.get_referrers` should explain the result format (i.e. what keys in the dict mean)

[Ram Rachum]

New submission from Ram Rachum:

My mistake

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resolution:  -> not a bug
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27563>
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