Auto merge of #21997 - Manishearth:rollup, r=alexcrichton

None

src/rustbook/javascript.rs

@@ -43,7 +43,7 @@ document.addEventListener("DOMContentLoaded", function(event) {
   // of each of the sections.
   // It works by extracting the current page based on the url and iterates over
   // the menu links until it finds the menu item for the current page. We then
-  // create a copy of the preceeding and following menu links and add the
+  // create a copy of the preceding and following menu links and add the
   // correct css class and insert them into the bottom of the page.
   var toc = document.getElementById('toc').getElementsByTagName('a');
   var href = document.location.pathname.split('/').pop();