fix option name

Author: rustagir

source/whats-new.txt

@@ -81,7 +81,7 @@ improvements, and fixes:
 
 - Removes the deprecated ``IndexInfo::isGeoHaystack()`` method.
 
-- Removes the deprecated ``autoIndex`` option for the
+- Removes the deprecated ``autoIndexId`` option for the
   ``MongoDB\\Database::createCollection()`` method.
 
 - Drops support for map-reduce functionality by removing the following