[docs] [issue16518] add "buffer protocol" to glossary

[Antoine Pitrou]

Antoine Pitrou added the comment:

> I also noticed that on 2.7[0], the section about the buffer protocol
> in Doc/c-api/buffer.rst is called "Buffers and Memoryview Objects" and
> it's not as clear as the one on 3.x[1].  Should this section be
> backported?

The "buffer protocol" situation is different on 2.x, please let's
concentrate on 3.x :-)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16518>
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