RFR: JDK-8295236: Update JavaDoc in javafx.geometry.Point3D

[Douglas Held]

The JavaDoc for equals had a copy/paste error. I normalized the text based on the JavaDoc for method java.awt.Point#equals. I also changed formatting in the method signatures of equals(), hashCode() and toString().

For good measure, some kind of copy/paste detection should probably be added to the many automated checks. For the entire OpenJDK project.

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Commit messages:
 - Update JavaDoc in javafx.geometry.Point3D

Changes: https://git.openjdk.org/jfx/pull/913/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=913&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295236
  Stats: 11 lines in 1 file changed: 6 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jfx/pull/913.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/913/head:pull/913

PR: https://git.openjdk.org/jfx/pull/913