style($httpBackend): fix typo

Author: campersau

src/ng/httpBackend.js

@@ -71,7 +71,7 @@ function createHttpBackend($browser, createXhr, $browserDefer, callbacks, rawDoc
       // response is in the cache. the promise api will ensure that to the app code the api is
       // always async
       xhr.onreadystatechange = function() {
-        // onreadystatechange might by called multiple times with readyState === 4 on mobile webkit caused by
+        // onreadystatechange might get called multiple times with readyState === 4 on mobile webkit caused by
         // xhrs that are resolved while the app is in the background (see #5426).
         // since calling completeRequest sets the `xhr` variable to null, we just check if it's not null before
         // continuing