RFR: 8247918: Clarify Reader.skip behavior for end of stream [v3]

[Roger Riggs]

On Fri, 12 Feb 2021 17:25:00 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> Please review this clarification of the specification of the method `skip(long)` in `java.io.Reader` and its subclasses. Specifically, the behavior of the method is made clear for the case when the `Reader` is already at the end of its stream when the method is invoked. A corresponding CSR will be filed. Also, the change includes an update to an existing test in order to verify that the specification change reflects actual behavior.
>
> Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8247918: Remove verbiage describing impossible behavior in CharArrayReader and StringReader

Marked as reviewed by rriggs (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/2274