Issue #14769: Incorporated mildly pedantic feedback from python-dev. Mostly documentation changes; the code changes are clarifications, not semantic changes.
Issue #14769: Incorporated mildly pedantic feedback from python-dev.
Mostly documentation changes; the code changes are clarifications,
not semantic changes.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator