[docs] [issue19411] binascii.hexlify docs say it returns a string (it returns bytes)

[Roundup Robot]

Roundup Robot added the comment:

New changeset 25d89a4faede by R David Murray in branch '3.3':
#19411: Clarify that b2a_hex/hexlify returns a bytes object.
http://hg.python.org/cpython/rev/25d89a4faede

New changeset ac190d03aed5 by R David Murray in branch 'default':
Merge #19411: Clarify that b2a_hex/hexlify returns a bytes object.
http://hg.python.org/cpython/rev/ac190d03aed5

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