RFR: 6587699: Document DigestInputStream behavior when skip() or mark() / reset() is used

[Weijun Wang]

On Thu, 28 Jul 2022 00:57:54 GMT, Bradford Wetmore <wetmore at openjdk.org> wrote:

> Be sure to update the commit message. :)

I think there is no need to use the bug description as the commit message, and I usually just use "the fix" as the commit message for the 1st commit.

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PR: https://git.openjdk.org/jdk/pull/9667