[docs] [issue15115] Duplicated Content-Transfer-Encoding header when applying email.encoders

[miss-islington]

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


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pull_requests: +13596
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/13709

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue15115>
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