Fixed typo in comment

architecture-examples/backbone/js/views/todo-view.js

@@ -97,7 +97,7 @@ var app = app || {};
 				if (value !== trimmedValue) {
 					// Model values changes consisting of whitespaces only are
 					// not causing change to be triggered Therefore we've to
-					// compare untrimmed version with a trimmed one to chech
+					// compare untrimmed version with a trimmed one to check
 					// whether anything changed
 					// And if yes, we've to trigger change event ourselves
 					this.model.trigger('change');