improve wording

Author: taefi

articles/hilla/lit/reference/type-nullability.adoc

@@ -141,7 +141,7 @@ Along with `@NonNull` annotations, you could also use package-level `@NonNullApi
 
 By default, the following annotation is supported: `org.springframework.lang.NonNullApi`.
 
-To make any type nullable, you must add `@Nullable` annotation to it. While any annotation that has the name `nullable` (case-insensitive) is supported, Vaadin recommends using the `org.jspecify.annotations.Nullable`.
+To make any type nullable, you must add `@Nullable` annotation to it. While the usage of any annotation that has the name `nullable` (case-insensitive) is supported, Vaadin recommends using the `org.jspecify.annotations.Nullable`.
 
 .`package-info.java`
 [source,java]