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

[Antoine Pitrou]

Antoine Pitrou added the comment:

> > I wouldn't use "bytes-like object".
> 
> What about "buffer-like object"?

"buffer-like" means "like a buffer" which is wrong on two points:
- "buffer" is not defined at this point, so the user doesn't understand
what it means
- we are not talking about an object which is "like a buffer", but which
"provides a buffer"

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