better docs per review suggestion

Author: nyurik

clippy_lints/src/new_without_default.rs

@@ -85,8 +85,9 @@ declare_clippy_lint! {
     /// }
     /// ```
     ///
-    /// Alternatively, if the `new()` method requires a non-default initialization, implement a custom `Default`.
-    /// This also allows you to mark the `new()` implementation as `const`:
+    /// Alternatively, if the `new()` method requires a non-default initialization, consider renaming
+    /// it to another less standard name. Lastly, if the `new()` method needs to be `const`,
+    /// implement a custom `Default`:
     ///
     /// ```no_run
     /// struct MyStruct(i32);