[docs] [issue17841] Remove missing aliases from codecs documentation

[Nick Coghlan]

Changes by Nick Coghlan <ncoghlan at gmail.com>:


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assignee:  -> docs at python
components: +Documentation
nosy: +docs at python
stage:  -> needs patch
type:  -> behavior

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17841>
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