Merge pull request #750 from rossmacarthur/fix-659

Fix `Route::serve_dir` docs

Author: yoshuawuyts

src/route.rs

@@ -127,7 +127,7 @@ impl<'a, State: Clone + Send + Sync + 'static> Route<'a, State> {
     /// #[async_std::main]
     /// async fn main() -> Result<(), std::io::Error> {
     ///     let mut app = tide::new();
-    ///     app.at("/public/images").serve_dir("images/")?;
+    ///     app.at("/images").serve_dir("public/images/")?;
     ///     app.listen("127.0.0.1:8080").await?;
     ///     Ok(())
     /// }