RFR: 8321573: Improve Platform.Preferences documentation [v3]

[Michael Strauß]

> This PR enhances the documentation of `Platform.Preferences.accentColor`:
> 
> 
>    /**
> -   * The accent color.
> +   * The accent color, which can be used to highlight the active or important part of a
> +   * control and make it stand out from the rest of the user interface. It is usually a
> +   * vivid color that contrasts with the foreground and background colors.
> 
> 
> Additional changes include alternating row colors for tables.

Michael Strauß has updated the pull request incrementally with one additional commit since the last revision:

  review comments

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Changes:
  - all: https://git.openjdk.org/jfx/pull/1301/files
  - new: https://git.openjdk.org/jfx/pull/1301/files/c1e78a04..24e3e1bd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1301&range=02
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1301&range=01-02

  Stats: 9 lines in 1 file changed: 2 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jfx/pull/1301.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1301/head:pull/1301

PR: https://git.openjdk.org/jfx/pull/1301