Change formulation of known problems section

Author: flip1995

clippy_lints/src/matches.rs

@@ -459,8 +459,8 @@ declare_clippy_lint! {
     ///
     /// **Why is this bad?** Readability and needless complexity.
     ///
-    /// **Known problems:** It can be FP triggered, when some arms have `cfg`
-    /// attributes, which evaluate into `false`.
+    /// **Known problems:** This lint falsely triggers, if there are arms with
+    /// `cfg` attributes that remove an arm evaluating to `false`. 
     ///
     /// **Example:**
     /// ```rust