Change url for flatten example

Related to metafacture/metafacture-playground#218

Author: TobiasNx

linksAndExamples.tsv

@@ -44,7 +44,7 @@ filter-records-by-path	https://github.com/metafacture/metafacture-core/blob/mast
 filter-strings	https://github.com/metafacture/metafacture-core/blob/master/metafacture-strings/src/main/java/org/metafacture/strings/StringFilter.java	https://metafacture.org/playground/?example=filter-strings
 filter-triples	https://github.com/metafacture/metafacture-core/blob/master/metafacture-triples/src/main/java/org/metafacture/triples/TripleFilter.java	https://metafacture.org/playground/?example=filter-triples
 find-fix-paths	https://github.com/metafacture/metafacture-fix/blob/master/metafix/src/main/java/org/metafacture/metafix/FindFixPaths.java 	https://metafacture.org/playground/?example=find-fix-paths
-flatten	https://github.com/metafacture/metafacture-core/blob/master/metafacture-mangling/src/main/java/org/metafacture/mangling/StreamFlattener.java	https://metafacture.org/playground/?example=flatten
+flatten	https://github.com/metafacture/metafacture-core/blob/master/metafacture-mangling/src/main/java/org/metafacture/mangling/StreamFlattener.java	https://metafacture.org/playground/?example=flatten_in_flux
 from-jdom-document	https://github.com/metafacture/metafacture-core/blob/master/metafacture-jdom/src/main/java/org/metafacture/jdom/JDomDocumentToStream.java	
 handle-cg-xml	https://github.com/metafacture/metafacture-core/blob/master/metafacture-xml/src/main/java/org/metafacture/xml/CGXmlHandler.java	
 handle-comarcxml	https://github.com/metafacture/metafacture-core/blob/master/metafacture-biblio/src/main/java/org/metafacture/biblio/ComarcXmlHandler.java