chore(grid): observable data and onread infinite loop note

Author: marin-bratanov

components/grid/refresh-data.md

@@ -82,6 +82,8 @@ In this article:
 
 @[template](/_contentTemplates/common/observable-data.md#tip-for-new-collection)
 
+>note If you are using the [OnRead event to implement the data operations manually](manual-operations), you must not use the `.Add()`, `.Remove()` or `.Clear()` method of an observable collection - the grid monitors that collection and it fires the `OnRead` event when it changes, so calling those methods will result in an infinte loop. Either create a new collection, or use a simple List, or do not use OnRead with observable data.
+
 ## New Collection Reference
 
 @[template](/_contentTemplates/common/observable-data.md#refresh-data)