RFR: 8336331: Doc: Clarification in AccessibleAttribute, AccessibleRole [v2]

[Andy Goryachev]

> Minor clarifications in Javadoc
> 
> **AccessibleAttribute**:
> - Point2D and Bound values uses screen coordinates. Example: `BOUNDS`, `BOUNDS_FOR_RANGE`, `OFFSET_AT_POINT`, ...
> - clarified the meaning of `SELECTION_END`, `SELECTION_START`
> 
> **Accessible Role**:
> - missing accessible action `SHOW_TEXT_RANGE`
> 
> This will be a minor clarification, so no CSR is required.

Andy Goryachev has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - review comments
 - Merge branch 'master' into 8336331.acc.attr
 - 8336331: Doc: Clarification in AccessibleAttribute, AccessibleRole

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/1512/files
  - new: https://git.openjdk.org/jfx/pull/1512/files/6452ac3a..139983d3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1512&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1512&range=00-01

  Stats: 201 lines in 8 files changed: 184 ins; 1 del; 16 mod
  Patch: https://git.openjdk.org/jfx/pull/1512.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1512/head:pull/1512

PR: https://git.openjdk.org/jfx/pull/1512