Line length fix

Author: Kampfkarren

clippy_lints/src/types.rs

@@ -73,7 +73,8 @@ declare_clippy_lint! {
 /// **Why is this bad?** `Vec` already keeps its contents in a separate area on
 /// the heap. So if you `Box` its contents, you just add another level of indirection.
 ///
-/// **Known problems:** Vec<Box<T: Sized>> makes sense if T is a large type (see #3530, 1st comment).
+/// **Known problems:** Vec<Box<T: Sized>> makes sense if T is a large type (see #3530,
+/// 1st comment).
 ///
 /// **Example:**
 /// ```rust