RFR: JDK-8286470: Support searching for sections in class/package javadoc

Fri May 26 14:43:25 UTC 2023

Please review a change to generate search index entries for all HTML headings in the documentation comments and auxiliary files. The change is relatively straightforward, new new code replaces and complements the code to generate `id` attributes for all headings.

JDK API docs generated with this change are available here: https://cr.openjdk.org/~hannesw/8286470/api.00/

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Commit messages:
 - JDK-8286470: Support searching for sections in class/package javadoc

Changes: https://git.openjdk.org/jdk/pull/14179/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14179&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8286470
  Stats: 135 lines in 5 files changed: 70 ins; 14 del; 51 mod
  Patch: https://git.openjdk.org/jdk/pull/14179.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14179/head:pull/14179

PR: https://git.openjdk.org/jdk/pull/14179