[docs] [issue35781] `logger.warn` method is used in "Logging HOWTO" documentation though `logger.warn` method is deprecated in Python 3.7

[miss-islington]

Change by miss-islington <mariatta.wijaya+miss-islington at gmail.com>:


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pull_requests: +11451, 11453

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35781>
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