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

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#newcode2... 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/