fixes typo

Author: wilburpowery

docs/source/_assets/js/nav.js

@@ -36,7 +36,7 @@ $.when($.ready).then(function() {
       // Scroll to the top of the page
       $(document).scrollTop(0)
 
-      // Add page load to brower history
+      // Add page load to browser history
       window.history.pushState({
         'href': href,
         'title': title,