add <%= to fields_for examples

railties/guides/source/action_view_overview.textile

@@ -699,7 +699,7 @@ Creates a scope around a specific model object like form_for, but doesn‘t crea
   First name: <%= person_form.text_field :first_name %>
   Last name : <%= person_form.text_field :last_name %>
 
-  <% fields_for @person.permission do |permission_fields| %>
+  <%= fields_for @person.permission do |permission_fields| %>
     Admin?  : <%= permission_fields.check_box :admin %>
   <% end %>
 <% end %>

railties/guides/source/getting_started.textile

@@ -1342,7 +1342,7 @@ We also add a <tt>@post.tags.build</tt> at the top of this form, this is to make
 Now create the folder <tt>app/views/tags</tt> and make a file in there called <tt>_form.html.erb</tt> which contains the form for the tag:
 
 <erb>
-<% form.fields_for :tags do |tag_form| %>
+<%= form.fields_for :tags do |tag_form| %>
   <div class="field">
     <%= tag_form.label :name, 'Tag:' %>
     <%= tag_form.text_field :name %>

railties/guides/source/nested_model_forms.textile

@@ -143,7 +143,7 @@ Now add a nested form for the +address+ association:
 <%= form_for @person do |f| %>
   <%= f.text_field :name %>
   
-  <% f.fields_for :address do |af| %>
+  <%= f.fields_for :address do |af| %>
     <%= f.text_field :street %>
   <% end %>
 <% end %>
@@ -184,7 +184,7 @@ The form code for an association collection is pretty similar to that of a singl
 <%= form_for @person do |f| %>
   <%= f.text_field :name %>
   
-  <% f.fields_for :projects do |pf| %>
+  <%= f.fields_for :projects do |pf| %>
     <%= f.text_field :name %>
   <% end %>
 <% end %>