test/py: use " for docstrings
Python's coding style docs indicate to use " not ' for docstrings. test/py has other violations of the coding style docs, since the docs specify a stranger style than I would expect, but nobody has complained about those yet:-) Signed-off-by: NStephen Warren <swarren@nvidia.com> Reviewed-by: NSimon Glass <sjg@chromium.org>
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