Add warnings not to edit files copied from graphql-java

Author: vojtapol

src/main/kotlin/graphql/kickstart/tools/directive/SchemaDirectiveWiringEnvironmentImpl.java

@@ -21,6 +21,11 @@
 
 import static graphql.Assert.assertNotNull;
 
+/*
+ * DO NOT EDIT THIS FILE!
+ *
+ * File copied from com.graphql-java.graphql-java:14.0 without changes.
+ */
 @Internal
 public class SchemaDirectiveWiringEnvironmentImpl<T extends GraphQLDirectiveContainer> implements
     SchemaDirectiveWiringEnvironment<T> {

src/main/kotlin/graphql/kickstart/tools/directive/SchemaGeneratorDirectiveHelper.java

@@ -33,7 +33,13 @@
 import static graphql.Assert.assertNotNull;
 import static java.util.stream.Collectors.toList;
 
-/**
+/*
+ * DO NOT EDIT THIS FILE!
+ *
+ * File copied from com.graphql-java.graphql-java:14.0 without changes.
+ */
+
+ /**
  * This contains the helper code that allows {@link graphql.schema.idl.SchemaDirectiveWiring} implementations to be
  * invoked during schema generation.
  */