Update doc/guides/3 - Advanced Techniques and Tips/3 - Using Custom V…

…iew or Layout Templates.textile

Changed line contained a typo, should be content_for, as content_for? is not a method of the @page object

doc/guides/3 - Advanced Techniques and Tips/3 - Using Custom View or Layout Templates.textile

@@ -60,7 +60,7 @@ Create +app/views/refinery/pages/about_us.html.erb+, where +about_us+ is the
 name of the file you whitelisted.
 
 * Inside of this file, you can either +render '/refinery/content_page'+, or you
-can use +@page.content_for?(:body)+ to output the content of a specific page part.
+can use +@page.content_for(:body)+ to output the content of a specific page part.
 
 h4. Set Back-End Select