docs: shift 20.2 rc dates by two weeks to match reality
The release candidates have slipped by a couple of weeks, so let's fix the dates in the calendar.
/cc @dbaker
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
The release candidates have slipped by a couple of weeks, so let's fix the dates in the calendar.
/cc @dbaker