Remove Dracula Transform reference (dotnet#37)

Author: JRAlexander

dotnet/xml/Microsoft.ML.Runtime.Data/HashJoin.xml

@@ -30,7 +30,7 @@
       </AssemblyInfo>
       <Attributes>
         <Attribute>
-          <AttributeName>Microsoft.ML.Runtime.EntryPoints.TlcModule/EntryPoint(Desc="Converts column values into hashes. This transform accepts both numeric and text inputs, both single and vector-valued columns. This is a part of the Dracula transform.", Name="Transforms.HashConverter", ShortName="HashJoin", UserName="Hash Join Transform")</AttributeName>
+          <AttributeName>Microsoft.ML.Runtime.EntryPoints.TlcModule/EntryPoint(Desc="Converts column values into hashes. This transform accepts both numeric and text inputs, both single and vector-valued columns.", Name="Transforms.HashConverter", ShortName="HashJoin", UserName="Hash Join Transform")</AttributeName>
         </Attribute>
       </Attributes>
       <ReturnValue>
@@ -49,4 +49,4 @@
       </Docs>
     </Member>
   </Members>
-</Type>
+</Type>