RFR: 8216507: StyleablePropertyFactory: example in class javadoc does not compile [v3]

[Karthik P K]

> In the javadoc example of `StyleablePropertyFactory` class, wrong parameter was used while initializing `StyleableProperty`. 
> 
> Assigned the `CssMetadData` object to `SELECTED` variable returned by `createBooleanCssMetaData` method called in anonymous inner-class class, which is then used while initializing `StyleableProperty`.
> 
> Added missing semicolon in the same example.

Karthik P K has updated the pull request incrementally with one additional commit since the last revision:

  Add unit test for javadoc example of StyleablePropertyFactory

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Changes:
  - all: https://git.openjdk.org/jfx/pull/983/files
  - new: https://git.openjdk.org/jfx/pull/983/files/cf0b0ee1..8e1bbb4b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=983&range=02
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=983&range=01-02

  Stats: 14 lines in 1 file changed: 13 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx/pull/983.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/983/head:pull/983

PR: https://git.openjdk.org/jfx/pull/983