[docs] [issue31571] Redundand information on Doc/reference/lexical_analysis.rst

[Mariatta Wijaya]

Changes by Mariatta Wijaya <mariatta.wijaya at gmail.com>:


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stage:  -> patch review
versions: +Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31571>
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