RFR: JDK-8314489: Add javadoc index entries for java.lang.Math terms [v2]

[Joe Darcy]

> Use of javadoc search index feature; I'll re-flow paragraphs before pushing once the wording is agreed to.

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

  Respond to review feedback.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15322/files
  - new: https://git.openjdk.org/jdk/pull/15322/files/0bf30783..26438061

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15322&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15322&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15322.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15322/head:pull/15322

PR: https://git.openjdk.org/jdk/pull/15322