85ec622e11

In 2021 there was a change [1] in tox role default values. However, the readme was not updated as part of this change. This commit adds the missed note. [1] https://review.opendev.org/c/zuul/zuul-jobs/+/807702 Change-Id: Ifa5b37c854eddbcda677ec5cd67a59bc3384ba34
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