Merge pull request railsbridge#497 from jabbowaki/fix-typos-on-react-tutorial

fix minor spelling errors

Author: tjgrathwell

sites/en/javascript-to-do-list-with-react/adding_an_item.step

@@ -171,7 +171,7 @@ the server responds. This abstract process is repeated over and over again:
 
 1. Listen for a user action on the page.
 2. Parse out the information the user is submitting.
-3. Prevent the default action from occuring, if necessary.
+3. Prevent the default action from occurring, if necessary.
 4. Make a request to the server using AJAX.
 5. When the request succeeds, parse the data the server sends back.
 6. Update the page with the newly received data.

sites/en/javascript-to-do-list-with-react/marking_an_item_as_complete.step

@@ -22,7 +22,7 @@ end
 steps do
   step do
     message "Let's add a click listener to our Item component's complete button. Find the line of code
-    that creating ths completion button, and add an onClick attribute to make React listen for your users'
+    that is creating the completion button, and add an onClick attribute to make React listen for your users'
     clicks. Your code should look like this:"
 
     source_code :javascript, <<-JAVASCRIPT