Github user JoshRosen commented on the issue:
https://github.com/apache/spark/pull/18207
As of #17355 we no longer test against Python 2.6. That doesn't mean that
2.6 won't work today, but there's nothing stopping 2.6 support from breaking in
a future 2.2.x release because we are no longer testing against that release.
#17355 replaced our Python 2.6 testing environment with a Python 2.7
release, so we can now begin to use language features and libraries which are
only available from 2.7 onwards (such as set and dictionary comprehensions).
Therefore, this documentation change looks correct to me.
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