Merge branch '5.3.x'

src/docs/asciidoc/integration.adoc

@@ -325,7 +325,7 @@ to serialize only a subset of the object properties, as the following example sh
 ----
 
 [[rest-template-multipart]]
-===== Multipart
+==== Multipart
 
 To send multipart data, you need to provide a `MultiValueMap<String, Object>` whose values
 may be an `Object` for part content, a `Resource` for a file part, or an `HttpEntity` for

src/docs/asciidoc/web/websocket.adoc

@@ -1347,7 +1347,7 @@ receipt if the server supports it (simple broker does not). For example, with th
 	headers.setDestination("/topic/...");
 	headers.setReceipt("r1");
 	FrameHandler handler = ...;
-	stompSession.subscribe(headers, handler).addReceiptTask(() -> {
+	stompSession.subscribe(headers, handler).addReceiptTask(receiptHeaders -> {
 		// Subscription ready...
 	});
 ----