Update content/graphql/field-middleware.md

Author: kamilmysliwiec

content/graphql/field-middleware.md

@@ -43,7 +43,7 @@ Now whenever we request the `title` field of `Recipe` object type, the original
 
 > info **Hint** To learn how you can implement a field-level permissions system with the use of [extensions](/graphql/extensions) feature, check out this [section](/graphql/extensions#using-custom-metadata).
 
-> warning **Warning** Field middleware can be applied ObjectType only. For more details, check out this [issue](https://github.com/nestjs/graphql/issues/2446).
+> warning **Warning** Field middleware can be applied only to `ObjectType` classes. For more details, check out this [issue](https://github.com/nestjs/graphql/issues/2446).
 
 Also, as mentioned above, we can control the field's value from within the middleware function. For demonstration purposes, let's capitalise a recipe's title (if present):