Delete html_root_url comment

Author: dtolnay

src/lib.rs

@@ -248,7 +248,6 @@
 //! - **`proc-macro`** *(enabled by default)* — Runtime dependency on the
 //!   dynamic library libproc_macro from rustc toolchain.
 
-// Syn types in rustdoc of other crates get linked to here.
 #![doc(html_root_url = "https://docs.rs/syn/2.0.113")]
 #![cfg_attr(docsrs, feature(doc_cfg), doc(auto_cfg = false))]
 #![deny(unsafe_op_in_unsafe_fn)]