[issue13538] Improve doc for str(bytesobject)

[Antoine Pitrou]

Antoine Pitrou added the comment:

Indeed:

>>> m = memoryview(b"")
>>> str(m, "utf-8")
''
>>> m.decode("utf-8")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'memoryview' object has no attribute 'decode'

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<http://bugs.python.org/issue13538>
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