Update tutorial.md (reactjs#366)

* Update tutorial.md

Correct the highlighted line to match the change that is being discussed, namely that the CommentForm can call the callback when the user submits the form

* Update tutorial.md

Also highlight changed line where onSubmit event handler is added to form tag.

* Update tutorial_aspnet4.md

Corrects the highlighted line in aspnet4 tutorial, to match the change that is being discussed, namely that the CommentForm can call the callback when the user submits the form

* Update tutorial_aspnet4.md

Also highlight changed line in aspnet4 tutorial, where onSubmit event handler is added to form tag.

* Update tutorial.md

Highlight complete block of added code lines.

* Update tutorial_aspnet4.md

Highlight complete block of added codes lines, in optimization part of tutorial.

Author: Dan Padmore

site/jekyll/getting-started/tutorial.md

@@ -697,7 +697,7 @@ React attaches event handlers to components using a camelCase naming convention.
 
 Let's make the form interactive. When the user submits the form, we should clear it, submit a request to the server, and refresh the list of comments. To start, let's listen for the form's submit event and clear it.
 
-```javascript{2-13,16-18}
+```javascript{2-13,16-18,23}
 var CommentForm = React.createClass({
   getInitialState: function() {
     return {author: '', text: ''};
@@ -785,7 +785,7 @@ var CommentBox = React.createClass({
 
 Now that `CommentBox` has made the callback available to `CommentForm` via the `onCommentSubmit` prop, the `CommentForm` can call the callback when the user submits the form:
 
-```javascript{9}
+```javascript{18}
 var CommentForm = React.createClass({
   getInitialState: function() {
     return {author: '', text: ''};
@@ -889,7 +889,7 @@ Continue on for more awesomeness!
 
 Our application is now feature complete but it feels slow to have to wait for the request to complete before your comment appears in the list. We can optimistically add this comment to the list to make the app feel faster.
 
-```javascript{12-14}
+```javascript{12-18}
 var CommentBox = React.createClass({
   loadCommentsFromServer: function() {
     var xhr = new XMLHttpRequest();

site/jekyll/getting-started/tutorial_aspnet4.md

@@ -656,7 +656,7 @@ React attaches event handlers to components using a camelCase naming convention.
 
 Let's make the form interactive. When the user submits the form, we should clear it, submit a request to the server, and refresh the list of comments. To start, let's listen for the form's submit event and clear it.
 
-```javascript{2-13,16-18}
+```javascript{2-13,16-18,23}
 var CommentForm = React.createClass({
   getInitialState: function() {
     return {author: '', text: ''};
@@ -744,7 +744,7 @@ var CommentBox = React.createClass({
 
 Now that `CommentBox` has made the callback available to `CommentForm` via the `onCommentSubmit` prop, the `CommentForm` can call the callback when the user submits the form:
 
-```javascript{9}
+```javascript{18}
 var CommentForm = React.createClass({
   getInitialState: function() {
     return {author: '', text: ''};
@@ -848,7 +848,7 @@ Continue on for more awesomeness!
 
 Our application is now feature complete but it feels slow to have to wait for the request to complete before your comment appears in the list. We can optimistically add this comment to the list to make the app feel faster.
 
-```javascript{12-14}
+```javascript{12-18}
 var CommentBox = React.createClass({
   loadCommentsFromServer: function() {
     var xhr = new XMLHttpRequest();