RFR: 8331214: Doc: update spec for SpinnerFactory classes [v2]

[drmarmac]

> This PR updates the javadoc for the SpinnerFactory wrap-around behavior introduced in #1431.

drmarmac has updated the pull request incrementally with one additional commit since the last revision:

  javaDoc updates according to code review

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/1450/files
  - new: https://git.openjdk.org/jfx/pull/1450/files/c491f8b8..0ecdfae1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1450&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1450&range=00-01

  Stats: 10 lines in 1 file changed: 2 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jfx/pull/1450.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1450/head:pull/1450

PR: https://git.openjdk.org/jfx/pull/1450