RFR: merge-bot: minor improvements to message

[Robin Westberg]

On Fri, 27 Mar 2020 14:56:11 GMT, Erik Helin <ehelin at openjdk.org> wrote:

> Hi all,
> 
> please review these refinements to instructions from the merge bot.
> 
> Testing:
> - `make test` passes on Linux x64
> 
> Thanks,
> Erik

Looks good!

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Marked as reviewed by rwestberg (Reviewer).

PR: https://git.openjdk.java.net/skara/pull/547