[docs] [issue19950] Document that unittest.TestCase.__init__ is called once per test

[Claudiu.Popa]

Claudiu.Popa added the comment:

"Each instance of the TestCase will only be used to run a single test method, so a new fixture is created for each test."

Yes, this seems to be, but it is not clear what fixture means in this context (as in "the preparation needed to perform one or *more* tests"?). Perhaps enhancing the message a little will suffice.

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