Update pages/data-lab/concepts.mdx

Co-authored-by: Jessica <[email protected]>

Author: SamyOubouaziz

pages/data-lab/concepts.mdx

@@ -12,7 +12,7 @@ categories:
   - managed-services
 ---
 
-## Apache Spark Cluster 
+## Apache Spark cluster
 
 An Apache Spark cluster is an orchestrated set of machines over which distributed/Big data calculus is processed. In the case of Scaleway Data Lab, the Apache Spark cluster is a Kubernetes cluster, with Apache Spark installed in each pod. For more details, check out the [Apache Spark documentation](https://spark.apache.org/documentation.html).