[docs] [issue14187] add "function annotation" entry to Glossary

[Chris Rebert]

Chris Rebert <pybugs at rebertia.com> added the comment:

Right, I can see how the 3rd paragraph has become tangential given the refined scope of the entry.

What do people think about a separate entry:

    "annotation"
        Can refer to either a `function annotation` or some uses of `decorator`s.

?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14187>
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