docs: fix typo in interface_config.js

interface_config.js

@@ -177,7 +177,7 @@ var interfaceConfig = {
      * The name of the toolbar buttons to display in the toolbar. If present,
      * the button will display. Exceptions are "livestreaming" and "recording"
      * which also require being a moderator and some values in config.js to be
-     * enabled. Also, the "profile" button will not display for user's with a
+     * enabled. Also, the "profile" button will not display for users with a
      * jwt.
      */
     TOOLBAR_BUTTONS: [