RFR: 8347305: RichTextArea Follow-up

[Andy Goryachev]

The changes:

- minor fixes in the behavior document (DELETE_WORD_PREVIOUS)
- Default width of RTA is less than half the size of TextArea (176 vs 478 on my Windows 11 system). Earlier the height was also too small, but you already fixed that.

The following is not an issue (works as designed):
- When running the demos, the current line highlight overlaps and obscures focus outline on right side (verified on Windows and Linux).

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Commit messages:
 - pref width
 - DELETE_WORD_PREVIOUS

Changes: https://git.openjdk.org/jfx/pull/1671/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1671&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8347305
  Stats: 4 lines in 2 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jfx/pull/1671.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1671/head:pull/1671

PR: https://git.openjdk.org/jfx/pull/1671