[doc] Fix link to abc.collections.Iterable (GH-22520)

Missed this occurrence before, sorry. Also changed "the PEP" to "PEP".

Automerge-Triggered-By: @gvanrossum
(cherry picked from commit 3fe6148937)

Co-authored-by: Andre Delfino <adelfino@gmail.com>
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Miss Skeleton (bot) 2020-10-03 09:13:14 -07:00 committed by GitHub
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@ -406,10 +406,10 @@ Initially :pep:`484` defined Python static type system as using
a class ``B`` is expected if and only if ``A`` is a subclass of ``B``.
This requirement previously also applied to abstract base classes, such as
:class:`Iterable`. The problem with this approach is that a class had
:class:`~collections.abc.Iterable`. The problem with this approach is that a class had
to be explicitly marked to support them, which is unpythonic and unlike
what one would normally do in idiomatic dynamically typed Python code.
For example, this conforms to the :pep:`484`::
For example, this conforms to :pep:`484`::
from collections.abc import Sized, Iterable, Iterator