RFR: Added section on maintainer-pain [v2]

[Igor Ignatyev]

On Tue, 17 Nov 2020 04:40:16 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.
> 
> 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?

I haven't seen it rendered, so for the present, I don't find it ugly at all ;)

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