[jfx22] RFR: 8325550: Grammatical error in AnchorPane.setLeftAnchor (and other setters) javadoc

[Nir Lisker]

Backport of commit [b43c4edf](https://github.com/openjdk/jfx/commit/b43c4edf7590429fd051d1b0e2ccb6dd49a10b8b) from the [openjdk/jfx](https://git.openjdk.org/jfx) repository.

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Commit messages:
 - Backport b43c4edf7590429fd051d1b0e2ccb6dd49a10b8b

Changes: https://git.openjdk.org/jfx/pull/1380/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1380&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8325550
  Stats: 66 lines in 3 files changed: 19 ins; 25 del; 22 mod
  Patch: https://git.openjdk.org/jfx/pull/1380.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1380/head:pull/1380

PR: https://git.openjdk.org/jfx/pull/1380