[jfx15] RFR: 8250799: NumberStringConverter and its subclasses are missing documentation for all their constructors [v2]

[Nir Lisker]

> This was missed the in Javadoc fixes for 15.
> 
> Added documentation for all the constructors, did a bit of formatting, and removed redundant comments.

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

  Added note on immutability

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

Changes:
  - all: https://git.openjdk.java.net/jfx/pull/277/files
  - new: https://git.openjdk.java.net/jfx/pull/277/files/5e7274ab..72c0b00d

Webrevs:
 - full: https://webrevs.openjdk.java.net/jfx/277/webrev.01
 - incr: https://webrevs.openjdk.java.net/jfx/277/webrev.00-01

  Stats: 4 lines in 3 files changed: 1 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jfx/pull/277.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/277/head:pull/277

PR: https://git.openjdk.java.net/jfx/pull/277