RFR: 8217496: Matcher.group() can return null after usePattern

[Stuart Marks]

On Thu, 2 Mar 2023 17:13:28 GMT, Ian Graves <igraves at openjdk.org> wrote:

> Updates to the documentation to describe behavior in Matcher.group().

LGTM

-------------

Marked as reviewed by smarks (Reviewer).

PR: https://git.openjdk.org/jdk/pull/12835