RFR: Section on PRs [v4]

[Iris Clark]

On Sat, 9 Apr 2022 11:15:40 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

>> Some tips for creating pull requests.
>
> Jesper Wilhelmsson has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update src/index.md
>   
>   Co-authored-by: Daniel Jelinski <djelinski1 at gmail.com>

Great tips taking into account lots of feedback from developers working on different parts of the JDK!  I suggest publishing the current content then using additional PRs for changes/refinements as necessary.

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Marked as reviewed by iris (Reviewer).

PR: https://git.openjdk.java.net/guide/pull/79