Update config.rs

Co-authored-by: dylan <dylan@init4.technology>

Author: prestwich

src/config.rs

@@ -47,7 +47,7 @@ pub struct BuilderConfig {
     #[from_env(var = "HOST_RPC_URL", desc = "URL for Host RPC node", infallible)]
     pub host_rpc_url: Cow<'static, str>,
     /// URL for the Rollup RPC node.
-    #[from_env(var = "ROLLUP_RPC_URL", desc = "URL for Host RPC node", infallible)]
+    #[from_env(var = "ROLLUP_RPC_URL", desc = "URL for Rollup RPC node", infallible)]
     pub ru_rpc_url: Cow<'static, str>,
     /// Additional RPC URLs to which to broadcast transactions.
     /// NOTE: should not include the host_rpc_url value