Update save.md

Author: mspilde

powerapps-docs/developer/model-driven-apps/clientapi/reference/formContext-data/save.md

@@ -33,6 +33,9 @@ You can also set an object to control how appointment, recurring appointment, or
 |successCallback|Function|No|A function to call when the operation succeeds.|
 |errorCallback|Function|No|A function to call when the operation fails. An object with the following properties will be passed:<br/><br/>- **errorCode**: Number. The error code.<br/><br/>- **message**: String. A localized error message.|
 
+[!NOTE]
+> When working with forms and you call formContext.data.save please be sure you call preventDefault to ensure any default save operation is not run when a user saves.
+
 
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