Masayuki Igawa 5fbca522de
[Doc] Fix python version in unit tests document
This commit fixes the python version which is supported officially. We
dropped Python 3.6 in the past commit[1] already and Python 2.7 is not
no longer supported. So we should be able to drop and replace the tox
job in the document.

[1] Ie844887a798a006794729e733748ceaa5e06d2db

Change-Id: If2998dd984aeb7d93bd49659d08a7212e16069c0
2022-10-12 13:39:12 +09:00
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