DOCSP-22631 Add 2dsphere example to Time Series Secondary Index (#7281)

* DOCSP-22631
Add 2dsphere example to Time Series Secondary Index

* DOCSP-22631 updates for NA's feedback

Author: kanchana-mongodb

source/core/timeseries/timeseries-secondary-index.txt

@@ -306,6 +306,20 @@ Starting in MongoDB 6.0, you can:
 
 - Use the ``metaField`` with :ref:`2dsphere <2dsphere-index>` indexes.
 
+  .. example:: 
+
+     .. code-block:: javascript
+
+        db.sensorData.createIndex({ "metadata.location": "2dsphere" })
+
+- Create ``2dsphere`` indexes on measurements.
+
+  .. example:: 
+
+     .. code-block:: javascript
+
+        db.sensorData.createIndex({ "currentConditions.tempF": "2dsphere" })
+
 .. note::
 
    .. include:: /includes/time-series-secondary-indexes-downgrade-FCV.rst