RFR: 8365305: The ARIA role ‘contentinfo’ is not valid for the element <footer>

[Pasam Soujanya]

Accessibility testing reported a violation with rule_id aria_role_valid for API docs which has role=contentinfo for footer HTML element. As per https://www.w3.org/TR/html-aria/#docconformance, if footer is a descendant of an article, aside, main, nav or section element, or an element with role=article, complementary, main, navigation or region then role=contentinfo is not allowed.

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Commit messages:
 - Fix accessibility arai_role_valid violation
 - Fix accessibility arai_role_valid violation

Changes: https://git.openjdk.org/jdk/pull/26737/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26737&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8365305
  Stats: 22 lines in 3 files changed: 0 ins; 1 del; 21 mod
  Patch: https://git.openjdk.org/jdk/pull/26737.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26737/head:pull/26737

PR: https://git.openjdk.org/jdk/pull/26737