Remove copypasta in CreateCollection

Author: jmikola

src/Operation/CreateCollection.php

@@ -95,9 +95,6 @@ public function __construct($databaseName, $collectionName, array $options = arr
     /**
      * Execute the operation.
      *
-     * For servers < 2.6, this will actually perform an insert operation on the
-     * database's "system.indexes" collection.
-     *
      * @see Executable::execute()
      * @param Server $server
      * @return object Command result document