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

[Claudiu.Popa]

Claudiu.Popa added the comment:

In Python 3 docs there is a hint in the documentation for `loadTestsFromModule`:

"This method searches module for classes derived from TestCase and creates an instance of the class for each test method defined for the class."

The phrase with a fixture per test from Python 2 docs is gone though. It would be nice if the same explanation from loadTestsFromModule could be applied to TestCase documentation.

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