docs: fix crlf in release-calendar
We generally don't use CRLFs in text-files, and let's not start now.
Fixes: 4ef25940 ("docs: Add calendar entries for 21.2 release candidates.")
We generally don't use CRLFs in text-files, and let's not start now.
Fixes: 4ef25940 ("docs: Add calendar entries for 21.2 release candidates.")