Correct typo, duplicate "passing" (#185)

Author: adamsilverstein

site/src/_includes/components/over-prefetching.njk

@@ -3,7 +3,7 @@
 {% sectionTitle "Concerned about over-prefetching? We've got you covered" %}
 {{ "By default `quicklink` observes all in-viewport links in `document.body`. There are different ways of telling `quicklink` to limit the number of links to prefetch." | markdown | safe }}
 
-{{ "The most common approach is passing passing different `options` to configure prefetching when calling `quicklink.listen()`:" | markdown | safe }}
+{{ "The most common approach is passing different `options` to configure prefetching when calling `quicklink.listen()`:" | markdown | safe }}
 
 {{ "* Indicating a specific DOM element to observe, with the `options.el` parameter:" | markdown | safe }}