Use "set up" rather than "setup" when used as a verb

axum/src/extract/ws.rs

@@ -312,7 +312,7 @@ impl<F> WebSocketUpgrade<F> {
 
     /// Finalize upgrading the connection and call the provided callback with
     /// the stream.
-    #[must_use = "to setup the WebSocket connection, this response must be returned"]
+    #[must_use = "to set up the WebSocket connection, this response must be returned"]
     pub fn on_upgrade<C, Fut>(self, callback: C) -> Response
     where
         C: FnOnce(WebSocket) -> Fut + Send + 'static,

axum/src/lib.rs

@@ -66,7 +66,7 @@
 //!
 //! # Routing
 //!
-//! [`Router`] is used to setup which paths goes to which services:
+//! [`Router`] is used to set up which paths goes to which services:
 //!
 //! ```rust
 //! use axum::{Router, routing::get};