Typo fix in Match(...) example, Tuple => $Tuple

[sleepytomcat]

docs.vavr.io provides an example for Match predicates:

Match(_try).of(
    Case($Success(Tuple2($("a"), $())), tuple2 -> ...),
    Case($Failure($(instanceOf(Error.class))), error -> ...)
);

(https://docs.vavr.io/#_patterns)

However, instead of Tuple type, the pattern $Tuple shall be used:

Match(_try).of(
    Case($Success($Tuple2($("a"), $())), tuple2 -> ...),
    Case($Failure($(instanceOf(Error.class))), error -> ...)
);

This PR addresses this typo.

[danieldietrich]

Sorry for the slight delay ... Thank you!