RFR: 1725: Clarify "no known role" error message [v2]

[Zhao Song]

> A user reported that when people review PRs, the bot adds a list of reviewers into description. If a user is not registered in OpenJDK Census, a note is added: 
> 
> (no known github.com user name / role) 
> 
> What it actually means is "no known OpenJDK user name / role".
> 
> Github.com is being used here because we are utilizing the name of the namespace. However, the purpose of the namespace is to map users from this namespace to either openjdk or internal. Actually, we couldn't find the user in openjdk or internal, not in the namespace. The census repository name can indicate whether it is openjdk or internal.

Zhao Song has updated the pull request incrementally with one additional commit since the last revision:

  fix a problem

-------------

Changes:
  - all: https://git.openjdk.org/skara/pull/1459/files
  - new: https://git.openjdk.org/skara/pull/1459/files/ab6d260e..d6479ee3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1459&range=01
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1459&range=00-01

  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/skara/pull/1459.diff
  Fetch: git fetch https://git.openjdk.org/skara pull/1459/head:pull/1459

PR: https://git.openjdk.org/skara/pull/1459