RFR: JDK-8313253: Rename methods in javadoc Comparators class

[Jonathan Gibbons]

Please review a fairly simple change, to simply rename methods in the `Comparators` class, to remove the `make` prefix from the method names, and (for consistency) in one case, remove `get`.  There are some updates to the more problematic javadoc comments as well.

It would be nice to think that the implementation of some methods could be improved by chaining use of simpler standard comparators, but that would be a different task.

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Commit messages:
 - JDK-8313253

Changes: https://git.openjdk.org/jdk/pull/15057/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15057&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313253
  Stats: 104 lines in 20 files changed: 7 ins; 5 del; 92 mod
  Patch: https://git.openjdk.org/jdk/pull/15057.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15057/head:pull/15057

PR: https://git.openjdk.org/jdk/pull/15057