gh-136216: Updated mentioned RFC in json module

[Viicos]

Also fixes #84271.

• Issue: Update mentioned RFC in json module #136216

[Viicos]

Seems like the errata for RFC 7159 wasn't really solved in 8259, but another errata (with different wording) also exists for RFC 8259.

The footnote is referenced here:

cpython/Doc/library/json.rst

Lines 11 to 16 in 836fbda

	`JSON (JavaScript Object Notation) <https://json.org>`_, specified by
	:rfc:`7159` (which obsoletes :rfc:`4627`) and by
	`ECMA-404 <https://ecma-international.org/publications-and-standards/standards/ecma-404/>`_,
	is a lightweight data interchange format inspired by
	`JavaScript <https://en.wikipedia.org/wiki/JavaScript>`_ object literal syntax
	(although it is not a strict subset of JavaScript [#rfc-errata]_ ).

Is it really relevant for the Python documentation? Should we remove this sentence entirely?

[read-the-docs-community]

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• genindex-B.html
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[Viicos]

This section is a bit ambiguous, and doesn't really match the last RFC which, as discussed in #136216 (comment), was updated to state:

JSON text exchanged between systems that are not part of a closed ecosystem MUST be encoded using UTF-8.

The documentation sentence is thus outdated, but also doesn't mention that thus us related to exchange between systems (which is out of scope of the json module, again as per #136216 (comment)). I see a couple options:

• Remove this sentence entirely.

• Update it with something like:

  Suggested change

  	The RFC requires that JSON, when exchanged between systems, must be represented using UTF-8.
  	The :mod:`!json` module doesn't handle the string encoding of JSON produced by the :func:`dump`
  	and :func:`dumps` functions. However, for maximum interoperability, :func:`load` and :func:`loads
  	will guess the encoding for :term:`binary file`, :class:`bytes` and :class:`bytearray` inputs.

[Viicos]

I had #136215 opened to remove the Unicode reference. Should I include it here?