Update email template of release docs #674
Merged
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Motivation
As I mentioned in this email, it is better to use dev KEYS instead of release KEYS in a vote email because release KEYS only include keys of PMC.
Ref. https://github.com/apache/pulsar/wiki/Create-GPG-keys-to-sign-release-artifacts
I also modify URL of source file so that we can easily find asc and shasum.