RFR: Added section on maintainer-pain [v2]

[Jesper Wilhelmsson]

On Tue, 17 Nov 2020 04:36:40 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

>> @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
>
> Just for the record, the maintainer-pain label and the use of it was discussed on jdk-dev here: https://mail.openjdk.java.net/pipermail/jdk-dev/2018-September/001929.html

> @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.

Currently all JBS labels in the Guide are linked to a description of the label. I see your point, it's unnecessary to link every single occurrence in such a short section, but if you don't mind terribly I'd like to maintain the invariant that every JBS label mentioned is linked ot the description.

Do you find it extremely ugly with all the links?

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