RFR: Added section on maintainer-pain [v3]

[Jesper Wilhelmsson]

On Mon, 23 Nov 2020 20:57:46 GMT, Phil Race <prr at openjdk.org> wrote:

>> Jesper Wilhelmsson has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Explicit examples and new header
>
> src/index.md line 983:
> 
>> 981: 
>> 982: * A bug that occurs frequently in testing, maybe on a specific platform, maybe specific to one vendor's test infrastructure, and requires that many maintainers investigate the failure in different test runs just to realize it's the same issue as have been seen and reported before, or worse, don't realize it's a known issue and file a duplicate bug in JBS.
>> 983: 
> 
> "as has" been seen

Fixed.

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