PEP 12: Extract Intersphinx section. Add example of Intersphinx reference. (#3827)

* PEP 12: Extract Intersphinx section. Add example of Intersphinx reference.

* Update peps/pep-0012.rst

Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>

---------

Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
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@ -647,8 +647,27 @@ If you find that you need to use a backslash in your text, consider
using inline literals or a literal block instead. using inline literals or a literal block instead.
Canonical Documentation and Intersphinx Intersphinx
--------------------------------------- -----------
You can use
`Intersphinx references
<https://www.sphinx-doc.org/en/master/usage/extensions/intersphinx.html>`_
to other Sphinx sites,
such as the `Python documentation <https://docs.python.org/>`_
`packaging.python.org <https://packaging.python.org/>`_,
and `typing.readthedocs.io <https://typing.readthedocs.io/>`_,
to easily cross-reference pages, sections and Python/C objects.
For example,
to create a link pointing to a section of the typing docs,
you would write the following::
:ref:`type expression <typing:type-expression>`
Canonical Documentation
-----------------------
As :pep:`PEP 1 describes <1#pep-maintenance>`, As :pep:`PEP 1 describes <1#pep-maintenance>`,
PEPs are considered historical documents once marked Final, PEPs are considered historical documents once marked Final,
@ -659,15 +678,6 @@ or an appropriate subclass:
* ``canonical-pypa-spec`` for packaging standards * ``canonical-pypa-spec`` for packaging standards
* ``canonical-typing-spec`` for typing standards * ``canonical-typing-spec`` for typing standards
Furthermore, you can use
`Intersphinx references
<https://www.sphinx-doc.org/en/master/usage/extensions/intersphinx.html>`_
to other Sphinx sites,
currently the `Python documentation <https://docs.python.org/>`_
and `packaging.python.org <https://packaging.python.org/>`_,
to easily cross-reference pages, sections and Python/C objects.
This works with both the "canonical" directives and anywhere in your PEP.
Add the directive between the headers and the first section of the PEP Add the directive between the headers and the first section of the PEP
(typically the Abstract) (typically the Abstract)
and pass as an argument an Intersphinx reference of the canonical doc/spec and pass as an argument an Intersphinx reference of the canonical doc/spec