[docs] [issue27026] async/await keywords are missing from reference docs

[Hong Minhee]

New submission from Hong Minhee:

The async/await keywords are missing from §2.3.1. Keywords in reference docs.

The attached patch adds two missing keywords to Doc/reference/lexical_analysis.rst file.

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assignee: docs at python
components: Documentation
files: patch.diff
hgrepos: 343
keywords: patch
messages: 265593
nosy: docs at python, hongminhee
priority: normal
severity: normal
status: open
title: async/await keywords are missing from reference docs
type: enhancement
versions: Python 3.5, Python 3.6
Added file: http://bugs.python.org/file42856/patch.diff

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<http://bugs.python.org/issue27026>
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