C#: Address review comments.

Author: michaelnebel

csharp/ql/lib/semmle/code/csharp/security/dataflow/flowsinks/AllSinks.qll

@@ -2,6 +2,11 @@
 
 private import semmle.code.csharp.dataflow.internal.ExternalFlow
 
+/**
+ * A data flow sink node.
+ */
+abstract class SinkNode extends DataFlow::Node { }
+
 /**
  * Module that adds all sinks to `SinkNode`, excluding sinks for cryptography based
  * queries, and queries where sinks are not succifiently explicit.
@@ -77,8 +82,3 @@ private module AllSinks {
     SinkNodeExternal() { sinkNode(this, _) }
   }
 }
-
-/**
- * A data flow sink node.
- */
-abstract class SinkNode extends DataFlow::Node { }

csharp/ql/lib/semmle/code/csharp/security/dataflow/flowsources/AllSources.qll

@@ -2,6 +2,11 @@
 
 private import semmle.code.csharp.dataflow.internal.ExternalFlow
 
+/**
+ * A data flow source node.
+ */
+abstract class SourceNode extends DataFlow::Node { }
+
 /**
  * Module that adds all sources to `SourceNode`, excluding source for cryptography based
  * queries, and queries where sources are not succifiently explicit or mainly hardcoded constants.
@@ -70,8 +75,3 @@ private module AllSources {
     SourceNodeExternal() { sourceNode(this, _) }
   }
 }
-
-/**
- * A data flow source node.
- */
-abstract class SourceNode extends DataFlow::Node { }