feat: document official support for the pattern matching API #2967
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What problem is this PR intended to solve?
Pattern matching was introduced as an experimental feature in v1.14.0 (see #2360 and #2523 for historical context).
Seeing downstream libraries adopt pattern matching for testing, as in rails/rails#49003, means this is apparently useful enough to start using.
Let's end experimental support and make it a fully-supported feature in the next minor release, v1.16.0.