RFR: 8333828: Use value javadoc tag in java.lang.{Float, Double} [v2]

[Joe Darcy]

> Use the value tag to make the javadoc for various format-related constants more informative to readers. Currently the information is available by following the "Constant Field Values" link.
> 
> I'll reflow the paragraphs before a push.

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

  Implement review feedback.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/19607/files
  - new: https://git.openjdk.org/jdk/pull/19607/files/ab3b9e38..ea23aaf0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19607&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19607&range=00-01

  Stats: 10 lines in 2 files changed: 0 ins; 0 del; 10 mod
  Patch: https://git.openjdk.org/jdk/pull/19607.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19607/head:pull/19607

PR: https://git.openjdk.org/jdk/pull/19607