use rich markup for PEP reference (GH-7939)

it's better to refer to PEP with `pep` role in reStructuredText. It also links to the PEP page.
(cherry picked from commit df748c20da)

Co-authored-by: Behzad B. Mokhtari <35877268+perplexionist@users.noreply.github.com>
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Miss Islington (bot) 2018-06-26 21:17:14 -07:00 committed by GitHub
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@ -249,7 +249,7 @@ Some tips for experts:
directory. directory.
* There is more detail on this process, including a flow chart of the * There is more detail on this process, including a flow chart of the
decisions, in PEP 3147. decisions, in :pep:`3147`.
.. _tut-standardmodules: .. _tut-standardmodules: