Update README.md

Author: go-oleg

README.md

@@ -61,15 +61,15 @@ var MyTodo = Backbone.Model.extend({
 
 ### fetch()
 In a collection with the `firebase` property defined, calling `fetch` will
-retrieve data from Firebase update the collection with its contents.
+retrieve data from Firebase and update the collection with its contents.
 
 ``` js
 TodoList.fetch();
 ```
 
 ### sync()
 In a collection with the `firebase` property defined, calling `sync` will
-set the contents of the local collection to the specifeid Firebase location.
+set the contents of the local collection to the specified Firebase location.
 
 ``` js
 TodoList.sync();
@@ -152,7 +152,7 @@ Messages.remove(someModel);
 ```
 
 ### create(value)
-Cretes and adds a new model to the collection. The newly created model is
+Creates and adds a new model to the collection. The newly created model is
 returned, along with a `id` property (uniquely generated by Firebase).
 
 ``` js