[docs] [issue11015] Bring test.support docs up to date

[Ezio Melotti]

Ezio Melotti added the comment:

> There are some other helper modules (such as test.script_helper)
> that could also stand to be made easier to find.

Documenting script_helper.py would be good too.  I seem to remember some discussion about merging it with support.py -- if that happens it can be documented there, otherwise a separate section/file should be created.

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