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