RFR: 8345777: Improve sections for inherited members

[Hannes Wallnöfer]

Please review a set of changes to make the sections for inherited members in API docs more usable. 

 - Link to the relevant member summary in the parent type instead of the top of the page in headings for inherited members
 - Omit parent type's package name in headings for inherited members
 - Add method signature as title attribute (tooltip) in links to inherited methods
 - Omit type bounds and do not create separate links for type parameters in links to inherited nested classes

Before/after comparisons for methods and nested classes (the first two items also apply to other kinds of members):

java.util.TreeMap:
-  inherited nested classes [before][1], [after][2]
-  inherited methods [before][3], [after][4]

java.util.Spliterator.OfInt:
 - inherited nested classes [before][5], [after][6]
 - inherited  methods [before][7], [after][8]

[1]: https://download.java.net/java/early_access/jdk25/docs/api/java.base/java/util/TreeMap.html#nested-class-summary
[2]: https://cr.openjdk.org/~hannesw/8345777/api.00/java.base/java/util/TreeMap.html#nested-class-summary

[3]: https://download.java.net/java/early_access/jdk25/docs/api/java.base/java/util/TreeMap.html#methods-inherited-from-class-java.util.AbstractMap
[4]: https://cr.openjdk.org/~hannesw/8345777/api.00/java.base/java/util/TreeMap.html#methods-inherited-from-class-java.util.AbstractMap

[5]: https://download.java.net/java/early_access/jdk25/docs/api/java.base/java/util/Spliterator.OfInt.html#nested-class-summary
[6]: https://cr.openjdk.org/~hannesw/8345777/api.00/java.base/java/util/Spliterator.OfInt.html#nested-class-summary

[7]: https://download.java.net/java/early_access/jdk25/docs/api/java.base/java/util/Spliterator.OfInt.html#methods-inherited-from-class-java.util.Spliterator
[8]: https://cr.openjdk.org/~hannesw/8345777/api.00/java.base/java/util/Spliterator.OfInt.html#methods-inherited-from-class-java.util.Spliterator

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Commit messages:
 - 8345777: Improve sections for inherited members

Changes: https://git.openjdk.org/jdk/pull/22651/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22651&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8345777
  Stats: 203 lines in 16 files changed: 72 ins; 46 del; 85 mod
  Patch: https://git.openjdk.org/jdk/pull/22651.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22651/head:pull/22651

PR: https://git.openjdk.org/jdk/pull/22651