Doc: Remove obsolete mention of Castle.DynamicProxy.

Author: oskarb

doc/reference/modules/performance.xml

@@ -276,7 +276,7 @@ int accessLevel = (int) permissions["accounts"];  // Error!]]></programlisting>
                 of persistent collections. However, a different mechanism is needed for lazy
                 behavior in single-ended associations. The target entity of the association must
                 be proxied. NHibernate implements lazy initializing proxies for persistent objects
-                using runtime bytecode enhancement (via the excellent Castle.DynamicProxy library).
+                using runtime bytecode enhancement.
             </para>
 
             <para>

doc/reference/modules/quickstart.xml

@@ -165,7 +165,7 @@
             No special interface has to be implemented for persistent classes nor do we have
             to subclass from a special root persistent class. NHibernate also doesn't use any
             build time processing, such as IL manipulation, it relies solely on
-            .NET reflection and runtime class enhancement (through Castle.DynamicProxy library).
+            .NET reflection and runtime class enhancement.
             So, without any dependency in the POCO class on NHibernate, we can map it to
             a database table.
         </para>