RFR: JDK-8294539: Augment discussion of equivalence relations on floating-point values [v5]

[Joe Darcy]

> While the floating-point == operation is *not* an equivalence relation, there are useful equivalence relations that can be defined over floating-point values. Text is added to java.lang.Double to discuss and name those relations.

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

  Appease jcheck; reflow paragraphs.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10498/files
  - new: https://git.openjdk.org/jdk/pull/10498/files/aaac7312..8aca6b30

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10498&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10498&range=03-04

  Stats: 16 lines in 1 file changed: 2 ins; 0 del; 14 mod
  Patch: https://git.openjdk.org/jdk/pull/10498.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10498/head:pull/10498

PR: https://git.openjdk.org/jdk/pull/10498