[issue14020] Improve HTMLParser doc

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

Didn’t review in detail but the plan LGTM.

In a subsequent commit, you could update the markup to use nested class/method directives.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14020>
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