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[3.13] gh-48181: Document codecs.charmap_build (GH-135997) (#136124)

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gh-48181: Document `codecs.charmap_build` (GH-135997)
(cherry picked from commit 2bdd50309f)

Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
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Doc/library/codecs.rst
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@ -53,6 +53,14 @@ any codec:
:exc:`UnicodeDecodeError`). Refer to :ref:`codec-base-classes` for more
information on codec error handling.
.. function:: charmap_build(string)
Return a mapping suitable for encoding with a custom single-byte encoding.
Given a :class:`str` *string* of up to 256 characters representing a
decoding table, returns either a compact internal mapping object
``EncodingMap`` or a :class:`dictionary <dict>` mapping character ordinals
to byte values. Raises a :exc:`TypeError` on invalid input.
The full details for each codec can also be looked up directly:
.. function:: lookup(encoding)