[docs] [issue21514] update json module docs in light of RFC 7159 & ECMA-404

[Chris Rebert]

New submission from Chris Rebert:

json module docs: https://docs.python.org/3/library/json.html

New superseding JSON RFC: https://tools.ietf.org/html/rfc7159
Errata to the new RFC: http://www.rfc-editor.org/errata_search.php?rfc=7159
ECMA-404: http://www.ecma-international.org/publications/standards/Ecma-404.htm

These updated specs are of particular relevance to the Standard Compliance section of the json module docs. There are also a bunch of new interoperability notes in the RFC that could probably bear repeating in the module's docs.

----------
assignee: docs at python
components: Documentation
messages: 218644
nosy: cvrebert, docs at python
priority: normal
severity: normal
status: open
title: update json module docs in light of RFC 7159 & ECMA-404
versions: Python 2.7, Python 3.5

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