* Enable collapsible-functionality on all elements in the collection.
*
* - Will prevent binding twice to the same element.
- * - Initial state is expanded by default, this can be overriden by adding class
+ * - Initial state is expanded by default, this can be overridden by adding class
* "mw-collapsed" to the "mw-collapsible" element.
* - Elements made collapsible have jQuery data "mw-made-collapsible" set to true.
* - The inner content is wrapped in a "div.mw-collapsible-content" (except for tables and lists).