Change the wording to be more clear

Author: dkubb

docs/pitfalls.md

@@ -17,7 +17,8 @@ Implicit String property length
 When declaring a String property, DataMapper will add an implicit limit of 50
 characters if no limit is explicitly declared.
 
-For example, the two class declarations have identical behaviour:
+For example, the following two models will have the same behaviour:
+
 {% highlight ruby linenos %}
 # with an implicit length
 class Post
@@ -33,6 +34,7 @@ class Post
   property :title, String, :length => 50
 end
 {% endhighlight %}
+
 The reason for this default is that DataMapper needs to know the underlying
 column constraints in order to add validations from the property definitions.
 Databases will often choose their own arbitrary length constraints if one is not