Add comment explaining stub files are temporary

Author: alcaeus

stubs/BSON/Document.stub.php

@@ -3,6 +3,8 @@
 namespace MongoDB\BSON;
 
 /**
+ * This stub file is temporary and can be removed when using Psalm 5
+ *
  * @template TValue
  * @template-implements \IteratorAggregate<string, TValue>
  */

stubs/BSON/Iterator.stub.php

@@ -1,13 +1,10 @@
 <?php
 
-/**
-  * @generate-class-entries static
-  * @generate-function-entries static
-  */
-
 namespace MongoDB\BSON;
 
 /**
+ * This stub file is temporary and can be removed when using Psalm 5
+ *
  * @psalm-template TKey of int|string
  * @psalm-template TValue
  * $psalm-implements \Iterator<TKey, TValue>

stubs/BSON/PackedArray.stub.php

@@ -3,6 +3,8 @@
 namespace MongoDB\BSON;
 
 /**
+ * This stub file is temporary and can be removed when using Psalm 5
+ *
  * @template TValue
  * @template-implements \IteratorAggregate<int, TValue>
  */