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

[Brian Burkhalter]

On Wed, 8 Sep 2021 22:00:53 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

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

CSR filed: [JDK-8273517](https://bugs.openjdk.java.net/browse/JDK-8273517).

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