organize writers hierarchy

src/main/java/kieker/analysis/graph/export/dot/DotElementWriter.java

@@ -9,7 +9,6 @@ import kieker.analysis.graph.Vertex;
 import kieker.analysis.graph.export.AbstractTransformer;
 import kieker.analysis.graph.util.dot.DotGraphWriter;
 
-//TODo rename, extends AbstractWriter
 class DotElementWriter extends AbstractTransformer<Void> {
 
 	protected final DotGraphWriter dotWriter;