RFR: 549: Links to users under Reviewers lead to a 404 page

[Robin Westberg]

Hi all,

Please review this change that improves the formatting of user names / link listed under Reviewers in the PR body. With
proper configuration, it will look something like this:

 * [Robin Westberg](https://openjdk.java.net/census#rwestberg) (@rwestberg - **Reviewer**)

Best regards,
Robin

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Commit messages:
 - Improve formatting of reviewer names in PR body

Changes: https://git.openjdk.java.net/skara/pull/763/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=763&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-549
  Stats: 53 lines in 5 files changed: 45 ins; 1 del; 7 mod
  Patch: https://git.openjdk.java.net/skara/pull/763.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/763/head:pull/763

PR: https://git.openjdk.java.net/skara/pull/763