docs(migration): fix minor typo

Closes angular#11994

Author: Xavier Haniquaut

docs/content/guide/migration.ngdoc

@@ -43,7 +43,7 @@ Animations in 1.4 have been refactored internally, but the API has stayed much t
 some breaking changes that need to be addressed when upgrading to 1.4.
 
 Due to [c8700f04](https://github.com/angular/angular.js/commit/c8700f04fb6fb5dc21ac24de8665c0476d6db5ef),
-JavaSript and CSS animations can no longer be run in
+JavaScript and CSS animations can no longer be run in
 parallel. With earlier versions of ngAnimate, both CSS and JS animations
 would be run together when multiple animations were detected. This
 feature has been removed, however, the same effect, with even more