[Workflow] Fix a RST syntax issue related to a code example

Author: javiereguiluz

components/workflow.rst

@@ -57,6 +57,8 @@ logic in one place and not spread all over your application.
 Usage
 -----
 
+Here's an example of using the workflow defined above::
+
     // ...
     // Consider that $blogPost is in place "draft" by default
     $blogPost = new BlogPost();