RFR: 8332313: Update code review guidelines

[Kevin Rushforth]

On Wed, 15 May 2024 17:45:56 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> Update the code review guidelines for JavaFX.
> 
> The JavaFX [CONTRIBUTING](https://github.com/kevinrushforth/jfx/blob/8332313-contributing/CONTRIBUTING.md) guidelines includes guidance for creating, reviewing, and integrating changes to JavaFX, along with a pointer to a [Code Review Policies](https://wiki.openjdk.org/display/OpenJFX/Code+Reviews) Wiki page.
> 
> This PR updates these guidelines to improve the quality of reviews, with a goal of improving JavaFX and decreasing the chance of introducing a serious regression or other critical bug.
> 
> The source branch has three commits:
> 1. Converts the Code Review Policies Wiki page to a [README-code-reviews.md](https://github.com/kevinrushforth/jfx/blob/8332313-contributing/README-code-reviews.md) file in the repo and updates hyperlinks to the new location.
> 2. Update `README-code-reviews.md` with new guidelines
> 3. Update `CONTRIBUTING.md` to highlight important requirements  (and minor changes to `README-code-reviews.md`)
> 
> Commit 1 is content neutral, so it might be helpful for reviewers to look at the changes starting from the second commit.
> 
> The updates are:
> 
> * In the Overview section, add a list of items for Reviewers, PR authors, and sponsoring Committers to verify prior to integration
> * Create a "Guidelines for reviewing a PR" subsection of the Code review policies section
> * Create a "Before you integrate or sponsor a PR" subsection of the Code review policies section
> * Update the `CONTRIBUTING.md` page to highlight important requirements

I replied to Andy's comments inline. Some of them are in unmodified sections and are out of scope for this, but I'll file a follow-on issue (P4).

I'll address the rest of the feedback in a subsequent commit.

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PR Review: https://git.openjdk.org/jfx/pull/1455#pullrequestreview-2058843801