[std] EReg.matched: clarify doc and fix return type#12942
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Fixes #9250.
matched() returns null when a sub-group was defined but did not participate in the match. Already
tested in TestEReg.hx but not documented. Changed return type from String to Null to reflect
that. Also split the previous "result is unspecified" sentence into two distinct cases: optional group not
matched vs. index out of range.