RFR: 8281057: Fix doc references to overriding in JLS

[Pavel Rappo]

While looking into guts of javadoc comment inheritance, I noticed that a number of places in JDK seem to confuse JLS 8.4.6.** with JLS 8.4.8.**.

Granted, "8.4.6 Method Throws" tangentially addresses overriding. However, I believe that the real target should be "8.4.8. Inheritance, Overriding, and Hiding" and its subsections.

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Commit messages:
 - Initial commit

Changes: https://git.openjdk.java.net/jdk/pull/7311/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7311&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281057
  Stats: 18 lines in 5 files changed: 0 ins; 0 del; 18 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7311.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7311/head:pull/7311

PR: https://git.openjdk.java.net/jdk/pull/7311