[docs] [issue33702] Add some missings links in production lists and a little polish

[Andrés Delfino]

New submission from Andrés Delfino <adelfino at gmail.com>:

There are some missing links in production lists (try, with, from __future__ import), and function and coroutines definitions production lists have too long lines.

PR fixes this and does some polish on whitespace.

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assignee: docs at python
components: Documentation
messages: 318231
nosy: adelfino, docs at python
priority: normal
severity: normal
status: open
title: Add some missings links in production lists and a little polish
type: enhancement
versions: Python 2.7, Python 3.6, Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33702>
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