RFR: 8375243: Improve javafx.scene.layout package documentation [v2]

[Michael Strauß]

> This PR adds a paragraph about layout orientation to the `javafx.scene.layout` package documentation.

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

  changes

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Changes:
  - all: https://git.openjdk.org/jfx/pull/2035/files
  - new: https://git.openjdk.org/jfx/pull/2035/files/32b34361..1d45b701

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=2035&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=2035&range=00-01

  Stats: 16 lines in 1 file changed: 3 ins; 1 del; 12 mod
  Patch: https://git.openjdk.org/jfx/pull/2035.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/2035/head:pull/2035

PR: https://git.openjdk.org/jfx/pull/2035