RFR: 8332748: Grammatical errors in animation API docs

[Lukasz Kostyra]

Checked code and fixed the gramatical error in Transition files: s/interval/intervals

Fill and Stroke Transition had correct grammatical form already, so those were untouched. I couldn't find any other instances of this error in our javadoc documentation.

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Commit messages:
 - Fix gramatical errors in Transition javadoc comments

Changes: https://git.openjdk.org/jfx/pull/1466/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1466&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8332748
  Stats: 4 lines in 4 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jfx/pull/1466.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1466/head:pull/1466

PR: https://git.openjdk.org/jfx/pull/1466