PHPLIB-1057: Note that geoHaystack was removed in MongoDB 5.0+

Author: jmikola

docs/reference/method/MongoDBModelIndexInfo-isGeoHaystack.txt

@@ -17,13 +17,17 @@ Definition
 
 .. phpmethod:: MongoDB\\Model\\IndexInfo::isGeoHaystack()
 
-   Return whether the index is a :manual:`geoHaystack
-   </core/geohaystack>` index.
+   Return whether the index is a :manual:`geoHaystack </core/geohaystack>`
+   index.
 
    .. code-block:: php
 
       function isGeoHaystack(): boolean
 
+   .. note::
+
+      MongoDB 5.0 and later no longer supports geoHaystack indexes.
+
 Return Values
 -------------