[issue46209] add documentation for decoding newlines in the `io` module

[Guo Ci Teo]

New submission from Guo Ci Teo <zguoci at gmail.com>:

add documentation for
`io.IncrementalNewlineDecoder`
`io.TextIOWrapper`
`io.StringIO`,
listing various ways to decode newlines

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messages: 409388
nosy: guoci
priority: normal
severity: normal
status: open
title: add documentation for decoding newlines in the `io` module

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46209>
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