RFR: 8216507: StyleablePropertyFactory: example in class javadoc does not compile [v2]

[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:

  Fix build error

-------------

Changes:
  - all: https://git.openjdk.org/jfx/pull/983/files
  - new: https://git.openjdk.org/jfx/pull/983/files/2ffeacaf..cf0b0ee1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=983&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=983&range=00-01

  Stats: 1 line in 1 file changed: 0 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