add clarification about resetting the return value when switching on …

…`ignoreResults` later

src/react/types/types.documentation.ts

@@ -533,6 +533,8 @@ export interface SubscriptionOptionsDocumentation {
 
   /**
    * If `true`, the hook will not cause the component to rerender. This is useful when you want to control the rendering of your component yourself with logic in the `onData` and `onError` callbacks.
+   *
+   * Changing this to `true` when the hook already had `data` will reset the `data` to `undefined`.
    */
   ignoreResults: unknown;
   /**