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 ------------- Commit messages: - Update CONTRIBUTING.md and README-code-reviews.md - 8332313: Update code review guidelines - Convert Code Review Policies Wiki to README-code-reviews.md Changes: https://git.openjdk.org/jfx/pull/1455/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1455&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8332313 Stats: 115 lines in 2 files changed: 106 ins; 0 del; 9 mod Patch: https://git.openjdk.org/jfx/pull/1455.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1455/head:pull/1455 PR: https://git.openjdk.org/jfx/pull/1455
