RFR: 8273513: Make java.io.FilterInputStream specification more precise about overrides

[Brian Burkhalter]

Modify the class level specification of `java.io.FilterInputStream` to be more exact about `java.io.InputStream` methods that it overrides.

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Commit messages:
 - 8273513: Make java.io.FilterInputStream specification more precise about overrides

Changes: https://git.openjdk.java.net/jdk/pull/5426/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5426&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273513
  Stats: 53 lines in 1 file changed: 21 ins; 9 del; 23 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5426.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5426/head:pull/5426

PR: https://git.openjdk.java.net/jdk/pull/5426