Mention --cap-lints on #[deny(warnings)] page

anti_patterns/deny-warnings.md

@@ -35,7 +35,8 @@ before there was none.
 All this conspires to potentially break the build whenever something changes.
 
 Furthermore, crates that supply additional lints (e.g. [rust-clippy]) can no
-longer be used unless the annotation is removed.
+longer be used unless the annotation is removed. This is mitigated with
+[--cap-lints].
 
 ## Alternatives
 
@@ -108,3 +109,4 @@ certain that there will be more deprecated APIs in the future.
 
 [rust-clippy]: https://github.com/Manishearth/rust-clippy
 [deprecate attribute]: https://doc.rust-lang.org/reference/attributes.html#deprecation
+[--cap-lints]: https://doc.rust-lang.org/rustc/lints/levels.html#capping-lints