[issue16523] attrgetter and itemgetter signatures in docs need cleanup

[Chris Jerdonek]

Chris Jerdonek added the comment:

+.. function:: attrgetter(attr[, attr2, attr3, ...])

Why not reword to use the *attr notation?  It is even already being used below:

+   The function is equivalent to::
 
       def attrgetter(*items):
           if any(not isinstance(item, str) for item in items):

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