add highliting

Author: Rnbsov

1-js/05-data-types/03-string/article.md

@@ -371,8 +371,8 @@ alert( "Widget".includes("id", 3) ); // false, from position 3 there is no "id"
 The methods [str.startsWith](mdn:js/String/startsWith) and [str.endsWith](mdn:js/String/endsWith) do exactly what they say:
 
 ```js run
-alert( "Widget".startsWith("Wid") ); // true, "Widget" starts with "Wid"
-alert( "Widget".endsWith("get") ); // true, "Widget" ends with "get"
+alert( "*!*Wid*/!*get".startsWith("Wid") ); // true, "Widget" starts with "Wid"
+alert( "Wid*!*get*/!*".endsWith("get") ); // true, "Widget" ends with "get"
 ```
 
 ## Getting a substring