doc: remove mention of deprecated ValidateRequestHeaderLayer::bearer in lib.rs comment

Author: VojtaStanek

tower-http/src/lib.rs

@@ -70,8 +70,6 @@
 //!         .layer(PropagateHeaderLayer::new(HeaderName::from_static("x-request-id")))
 //!         // If the response has a known size set the `Content-Length` header
 //!         .layer(SetResponseHeaderLayer::overriding(CONTENT_TYPE, content_length_from_response))
-//!         // Authorize requests using a token
-//!         .layer(ValidateRequestHeaderLayer::bearer("passwordlol"))
 //!         // Accept only application/json, application/* and */* in a request's Accept header
 //!         .layer(ValidateRequestHeaderLayer::accept("application/json"))
 //!         // Wrap a `Service` in our middleware stack