NEWS: Use past-tense, fix note about YAML cache
Description
As proposed in 108a38ed (comment 216141606),
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NEWS: Move note about YAML cache next to note about YAML API
This was incorrectly copy-pasted in the wrong location.
See 108a38ed (comment 216141606) for related discussion.
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NEWS: Try to use past tense consistently
Since the majority of the NEWS entries seem to be written in the past tense, change the handful of entries that aren't.