DOCSP-44237 flags Option deprecated

source/reference/method/MongoDBDatabase-createCollection.txt

@@ -117,6 +117,32 @@ Parameters
 
          .. versionadded:: 1.9
 
+     * - flags
+       - integer
+       - Available for the MMAPv1 storage engine only to set the ``usePowerOf2Sizes`` and 
+         ``noPadding`` flags.
+
+         The library provides constants that you can combine with a
+         :php:`bitwise OR operator <language.operators.bitwise>` to set the flag
+         values:
+
+         - ``MongoDB\Operation\CreateCollection::USE_POWER_OF_2_SIZES``: ``1``
+         - ``MongoDB\Operation\CreateCollection::NO_PADDING``: ``2``
+
+         Defaults to ``1``.
+
+         MongoDB 3.0 and later ignores the ``usePowerOf2Sizes`` flag. See
+         :manual:`collMod </reference/command/collMod>` and
+         :manual:`db.createCollection()
+         </reference/method/db.createCollection>` for more information.
+
+         *Deprecated as of v1.21*: This option is deprecated, as the MMAPv1 storage 
+         engine has been deprecated since {+mdb-server+} v4.2. The option will be removed in 
+         {+php-library+} v2.0. For more information on upgrading from the MMAPv1 storage 
+         engine to Wired Tiger, see the 
+         :manual:`Change a Self-Managed Standalone to WiredTiger </tutorial/change-standalone-wiredtiger/>` 
+         guide.
+
      * - indexOptionDefaults
        - array|object
        - Allows users to specify a default configuration for indexes when