[jfx20] RFR: 8293587: Fix mistakes in FX API docs [v3]

[Nir Lisker]

> Fixes and cleanup in the areas in the linked issue.

Nir Lisker has updated the pull request incrementally with three additional commits since the last revision:

 - Update modules/javafx.graphics/src/main/java/javafx/scene/text/TextFlow.java
   
   Co-authored-by: John Hendrikx <john.hendrikx+github at gmail.com>
 - Update modules/javafx.graphics/src/main/java/javafx/scene/text/TextFlow.java
   
   Co-authored-by: John Hendrikx <john.hendrikx+github at gmail.com>
 - Update modules/javafx.graphics/src/main/java/javafx/scene/text/TextFlow.java
   
   Co-authored-by: John Hendrikx <john.hendrikx+github at gmail.com>

-------------

Changes:
  - all: https://git.openjdk.org/jfx/pull/1025/files
  - new: https://git.openjdk.org/jfx/pull/1025/files/d2155e51..fe9c9889

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1025&range=02
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1025&range=01-02

  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jfx/pull/1025.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/1025/head:pull/1025

PR: https://git.openjdk.org/jfx/pull/1025