[issue40016] Clarify flag case in `re` module docstring

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

The docstring is currently 103 lines. I intentionally replaced 1 line with 1 line that I believe to be more informative and kept the expansion of the other line to 3 lines.

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<https://bugs.python.org/issue40016>
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