Updated upgrade guide

Author: Andrey Helldar

.upgrading/5.x_6.x.md

@@ -18,8 +18,8 @@ Changed the order of `api_response` function attributes from:
 function api_response(                      
     $data = null,
     int $status_code = 200,
-    array $headers = [],
-    array $with = [],
+    array $headers = [],    // here
+    array $with = [],       // here
     bool $use_data = true
 )
 ```
@@ -29,8 +29,8 @@ to:
 function api_response(
     $data = null,
     int $status_code = 200,
-    array $with = [],
-    array $headers = [],
+    array $with = [],       // here
+    array $headers = [],    // here
     bool $use_data = true
 )
 ```