[getting started] re-add new action back to PostsController, explain that it'll be explained in a short while

guides/source/getting_started.textile

@@ -685,9 +685,18 @@ format, and the existence of associated objects. Validations are covered in deta
 in "Active Record Validations and
 Callbacks":active_record_validations_callbacks.html#validations-overview
 
-With the validation now in place, when you call +@post.save+ on an invalid post, it will return +false+. If you open +app/controllers/posts_controller.rb+ again, you'll notice that we don't check the result of calling +@post.save+ inside the +create+ action. If +@post.save+ fails in this situation, we need to show the form back to the user. To do this, change the +create+ action inside +app/controllers/posts_controller.rb+ to this:
+With the validation now in place, when you call +@post.save+ on an invalid
+post, it will return +false+. If you open +app/controllers/posts_controller.rb+
+again, you'll notice that we don't check the result of calling +@post.save+
+inside the +create+ action. If +@post.save+ fails in this situation, we need to
+show the form back to the user. To do this, change the +new+ and +create+
+actions inside +app/controllers/posts_controller.rb+ to these:
 
 <ruby>
+def new
+  @post = Post.new
+end
+
 def create
   @post = Post.new(params[:post])
 
@@ -699,7 +708,10 @@ def create
 end
 </ruby>
 
-Notice that we use +render+ instead of +redirect_to+ when +save+
+The +new+ action is now creating a new instance variable called +@post+, and
+you'll see why that is in just a few moments.
+
+Notice that inside the +create+ action we use +render+ instead of +redirect_to+ when +save+
 returns +false+. The +render+ method is used so that the +@post+ object is passed back to the +new+ template when it is rendered. This rendering is done within the same request as the form submission, whereas the +redirect_to+ will tell the browser to issue another request.
 
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