Better order in description of changes to go/types.
Move go/types section up so it's in alphabetical order again.
No changes to actual content.
Change-Id: If2f085b665b412489e5dfdba79b7f93598ff2785
Reviewed-on: https://go-review.googlesource.com/c/go/+/546359 Reviewed-by: Alan Donovan <adonovan@google.com> Reviewed-by: Robert Griesemer <gri@google.com>
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