+ /**
+ * Filter available network-wide administration menu options.
+ *
+ * Options returned to this filter are output as individual checkboxes that, when selected,
+ * enable site administrator access to the specified administration menu in certain contexts.
+ *
+ * Adding options for specific menus here hinges on the appropriate checks and capabilities
+ * being in place in the site dashboard on the other side. For instance, when the single
+ * default option, 'plugins' is enabled, site administrators are granted access to the Plugins
+ * screen in their individual sites' dashboards.
+ *
+ * @since MU
+ *
+ * @param array $admin_menus The menu items available.
+ */