RFR: 8341100: Add index entries for terms used in java.lang.Class [v2]

[Joe Darcy]

> Small update to java.lang.Class docs.
> 
> I didn't add an index item for "hidden classes" since the indexing mechanism picks up the section titles.

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/21241/files
  - new: https://git.openjdk.org/jdk/pull/21241/files/dbf830a9..9e93a865

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21241&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21241&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/21241.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21241/head:pull/21241

PR: https://git.openjdk.org/jdk/pull/21241