Backport "doc: make TypeTest example compiling" to 3.3 LTS #378
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Current example is not compiling:
```scala
import scala.reflect.{ClassTag, TypeTest}
val tt: TypeTest[Any, String] =
new TypeTest[Any, String]:
def unapply(s: Any): Option[s.type & String] = s match
case s: String => Some(s) // compiler error Found: (s : String) Required: (s² : Any) & String
case _ => None
```
https://scastie.scala-lang.org/road21/jq3j9XsUTdeshqbHxDXv3w
[Cherry-picked 6c021c6]
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Backports scala#23009 to the 3.3.7.
PR submitted by the release tooling.
[skip ci]