Update README.md

Author: sindbach

README.md

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 # Docker for MongoDB and Apache Spark. 
 
-An example of docker-compose to set up a single [Apache Spark](http://spark.apache.org/) node connecting to [MongoDB](https://www.mongodb.com/) via * [MongoDB Spark Connector](https://github.com/mongodb/mongo-spark)
+An example of docker-compose to set up a single [Apache Spark](http://spark.apache.org/) node connecting to [MongoDB](https://www.mongodb.com/) via [MongoDB Spark Connector](https://github.com/mongodb/mongo-spark)
 
 ** For demo purposes only **