RFR: 720: Incorrect usage instructions for label command

[Robin Westberg]

On Thu, 24 Sep 2020 10:28:45 GMT, Erik Helin <ehelin at openjdk.org> wrote:

> Hi all,
> 
> please review this patch that improves the messages from the bots wrt to applied labels. For automatically applied
> labels we now list the labels more prominently. This is done to bring more attention to lists that will be CC:d. When
> no labels are automatically found then the message has been made a bit shorter by using a dropdown for revealing
> applicable labels. Both messages now link to the `/label` pull request command documentation instead of describing it
> in the messages.  Testing:
> - [x] Updated a unit test
> - [x] `make test` passes on Linux x64
> 
> Thanks,
> Erik

Marked as reviewed by rwestberg (Reviewer).

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PR: https://git.openjdk.java.net/skara/pull/842