RFR: JDK-8319988: Wrong heading for inherited nested classes

[Hannes Wallnöfer]

Please review a trivial fix to make javadoc use the correct heading for listings of inherited nested classes.

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Commit messages:
 - JDK-8319988: Wrong heading for inherited nested classes

Changes: https://git.openjdk.org/jdk/pull/16641/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16641&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319988
  Stats: 7 lines in 3 files changed: 0 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/16641.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16641/head:pull/16641

PR: https://git.openjdk.org/jdk/pull/16641