Fix convention

docs/manual/src/docs/asciidoc/_includes/test/method.adoc

@@ -11,7 +11,7 @@ public class HelloMessageService implements MessageService {
 	@PreAuthorize("authenticated")
 	public String getMessage() {
 		Authentication authentication = SecurityContextHolder.getContext()
-															.getAuthentication();
+			.getAuthentication();
 		return "Hello " + authentication;
 	}
 }