RFR: Added section on maintainer-pain [v2]

[Igor Ignatyev]

On Thu, 5 Nov 2020 19:14:12 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

>> Added section on maintainer-pain
>
> Jesper Wilhelmsson has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Refer to ProblemList section

@JesperIRL , looks good to me in general. however, I'm not sure that every occurrence of `maintainer-pain` should be a reference, usually, it's enough to have just 1st appearance as a reference.

-- Igor

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Marked as reviewed by iignatyev (no project role).

PR: https://git.openjdk.java.net/guide/pull/37