Fixed spelling error in README.md:85 `instantion` -> `instantiation`

README.md

@@ -82,7 +82,7 @@ If you are hosting your `.js` on a different domain (e.g. on a CDN) than the HTM
 
 	// Before loading vs/editor/editor.main, define a global MonacoEnvironment that overwrites
 	// the default worker url location (used when creating WebWorkers). The problem here is that
-	// HTML5 does not allow cross-domain web workers, so we need to proxy the instantion of
+	// HTML5 does not allow cross-domain web workers, so we need to proxy the instantiation of
 	// a web worker through a same-domain script
 	window.MonacoEnvironment = {
 		getWorkerUrl: function(workerId, label) {