matches: Disable running the docstring snippet

clippy_lints/src/matches.rs

@@ -919,7 +919,7 @@ fn contains_only_wilds(pat: &Pat<'_>) -> bool {
 ///
 /// For example:
 ///
-/// ```
+/// ```rust,no_run
 /// // Returns false, because the first arm contain enum without a wildcard.
 /// match x {
 ///     (Some(E::V), _) => todo!(),