The existing entry repeated the same info that was in the body text, which
means it didn't satisfy the sections "brevity" requirement :)

Fix urllib.request.build_opener mocking in test_distutils (should fix some random buildbot failures)

Fix urllib.request.build_opener mocking in test_distutils (should fix some random buildbot failures)

Issue #18879: When a method is looked up on a temporary file, avoid closing the file before the method is possibly called.

Issue #18879: When a method is looked up on a temporary file, avoid closing the file before the method is possibly called.

Also remove some extra blank lines in the ssl doc acctions for tls1.1/1.2,
and reflow a paragraph.

And link to it from the summary, and link to the Hash Algorithms
section of hashlib from the linked description.

I also further qualified the cross reference link, since those are
global names.