docs: add warning icon for extractor order (#2027)

axum-extra/src/extract/multipart.rs

@@ -23,7 +23,7 @@ use std::{
 
 /// Extractor that parses `multipart/form-data` requests (commonly used with file uploads).
 ///
-/// Since extracting multipart form data from the request requires consuming the body, the
+/// ⚠️ Since extracting multipart form data from the request requires consuming the body, the
 /// `Multipart` extractor must be *last* if there are multiple extractors in a handler.
 /// See ["the order of extractors"][order-of-extractors]
 ///

axum/src/extract/multipart.rs

@@ -22,7 +22,7 @@ use std::{
 
 /// Extractor that parses `multipart/form-data` requests (commonly used with file uploads).
 ///
-/// Since extracting multipart form data from the request requires consuming the body, the
+/// ⚠️ Since extracting multipart form data from the request requires consuming the body, the
 /// `Multipart` extractor must be *last* if there are multiple extractors in a handler.
 /// See ["the order of extractors"][order-of-extractors]
 ///

axum/src/form.rs

@@ -16,7 +16,7 @@ use serde::Serialize;
 /// requests and `application/x-www-form-urlencoded` encoded request bodies for other methods. It
 /// supports any type that implements [`serde::Deserialize`].
 ///
-/// Since parsing form data might require consuming the request body, the `Form` extractor must be
+/// ⚠️ Since parsing form data might require consuming the request body, the `Form` extractor must be
 /// *last* if there are multiple extractors in a handler. See ["the order of
 /// extractors"][order-of-extractors]
 ///

axum/src/json.rs

@@ -21,7 +21,7 @@ use serde::{de::DeserializeOwned, Serialize};
 /// type.
 /// - Buffering the request body fails.
 ///
-/// Since parsing JSON requires consuming the request body, the `Json` extractor must be
+/// ⚠️ Since parsing JSON requires consuming the request body, the `Json` extractor must be
 /// *last* if there are multiple extractors in a handler.
 /// See ["the order of extractors"][order-of-extractors]
 ///