[docs] Tighten definition of bytes-like objects (issue 23756)

[storchaka at gmail.com]

http://bugs.python.org/review/23756/diff/14408/Doc/c-api/buffer.rst
File Doc/c-api/buffer.rst (right):

http://bugs.python.org/review/23756/diff/14408/Doc/c-api/buffer.rst#newcode294
Doc/c-api/buffer.rst:294: buffers (with a single element) are considered
both C- and
May be one-dimensional too?

http://bugs.python.org/review/23756/diff/14408/Doc/glossary.rst
File Doc/glossary.rst (right):

http://bugs.python.org/review/23756/diff/14408/Doc/glossary.rst#newcode91
Doc/glossary.rst:91: :class:`bytearray` or :class:`memoryview`. 
Bytes-like objects can
May be worth to mention array.array (is it always C-contiguous?)?

http://bugs.python.org/review/23756/