[issue23964] Update README documentation for IDLE tests.

[Roundup Robot]

Roundup Robot added the comment:

New changeset 19e111891e39 by Terry Jan Reedy in branch '2.7':
Issue #23964: Update idlelib/idle_test/README.txt. first patch by Al Sweigart.
https://hg.python.org/cpython/rev/19e111891e39

New changeset 35b84ba2f8b1 by Terry Jan Reedy in branch '3.4':
Issue #23964: Update idlelib/idle_test/README.txt. first patch by Al Sweigart.
https://hg.python.org/cpython/rev/35b84ba2f8b1

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