style: allow clippy::too_long_first_doc_paragraph (#2488)

* style: allow clippy::too_long_first_doc_paragraph

* style: fmt

Author: SteveLauC

src/lib.rs

@@ -43,6 +43,9 @@
 #![crate_name = "nix"]
 #![cfg(unix)]
 #![allow(non_camel_case_types)]
+// A clear document is a good document no matter if it has a summary in its
+// first paragraph or not.
+#![allow(clippy::too_long_first_doc_paragraph)]
 #![recursion_limit = "500"]
 #![deny(unused)]
 #![allow(unused_macros)]