Updating title of Spark for Preprocessing to mention data

integration/apache-spark/apache-spark.adoc

@@ -53,7 +53,7 @@ The infrastructure is set up using Docker containers, there are dedicated contai
 * [Presentation: Combining Neo4j and Apache Spark using Docker]
 
 [[preprocessing]]
-== Spark Preprocessing
+== Spark for Data Preprocessing
 
 One example of pre-processing raw data (Chicago Crime dataset) into a format that's well suited for import into Neo4j, was demonstrated by http://twitter.com/markhneedham[Mark Needham]. 
 He combined a number of functions into a Spark-job that takes the existing data, cleans and aggregates it and outputs fragments which are recombined later to larger files.