Added description and title to Dynamic Scope Match

activerecord/lib/active_record/dynamic_scope_match.rb

@@ -1,4 +1,11 @@
 module ActiveRecord
+
+  # = Active Record Dynamic Scope Match
+  # 
+  # Provides dynamic attribute-based scopes such as <tt>scoped_by_price(4.99)</tt>
+  # if, for example, the <tt>Product</tt> has an attribute with that name. You can
+  # chain more <tt>scoped_by_* </tt> methods after the other. It acts like a named
+  # scope except that it's dynamic.
   class DynamicScopeMatch
     def self.match(method)
       ds_match = self.new(method)