Polish

See gh-27829

Author: snicoll

spring-core/src/main/java/org/springframework/aot/hint/package-info.java

@@ -1,5 +1,10 @@
 /**
- * Support for registering the need for reflection, resources, java serialization
- * and proxies.
+ * Support for registering the need for reflection, resources, java
+ * serialization and proxies at runtime.
  */
+@NonNullApi
+@NonNullFields
 package org.springframework.aot.hint;
+
+import org.springframework.lang.NonNullApi;
+import org.springframework.lang.NonNullFields;