@search instead of on-search

docs/guide/upgrading.md

@@ -69,10 +69,10 @@ has always provided the same parameters and can be used in it's place.
 <v-select @search="doSomeAjax" />
 ```
 
-### `onSearch` with null search string
+### `@search` with null search string
 
-The `onSearch` callback is now fired anytime the search string changes. In v2.x, the component
-would first check if the search string was empty, and only run the callback if it had at least one
+The `@search` event is now fired anytime the search string changes. In v2.x, the component
+would first check if the search string was empty, and only emit the event if it had at least one
 character. This was a design mistake, as it should be the consumers decision if a search should be
 run on an empty string.