Removed extra spaces between lines.

issue : unnecessary spaces present between the lines.

Author: PranitRout07

content/en/docs/tutorials/_index.md

@@ -20,31 +20,24 @@ Before walking through each tutorial, you may want to bookmark the
 ## Basics
 
 * [Kubernetes Basics](/docs/tutorials/kubernetes-basics/) is an in-depth interactive tutorial that helps you understand the Kubernetes system and try out some basic Kubernetes features.
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 * [Introduction to Kubernetes (edX)](https://www.edx.org/course/introduction-kubernetes-linuxfoundationx-lfs158x#)
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 * [Hello Minikube](/docs/tutorials/hello-minikube/)
 
 ## Configuration
 
 * [Example: Configuring a Java Microservice](/docs/tutorials/configuration/configure-java-microservice/)
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 * [Configuring Redis Using a ConfigMap](/docs/tutorials/configuration/configure-redis-using-configmap/)
 
 ## Stateless Applications
 
 * [Exposing an External IP Address to Access an Application in a Cluster](/docs/tutorials/stateless-application/expose-external-ip-address/)
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 * [Example: Deploying PHP Guestbook application with Redis](/docs/tutorials/stateless-application/guestbook/)
 
 ## Stateful Applications
 
 * [StatefulSet Basics](/docs/tutorials/stateful-application/basic-stateful-set/)
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 * [Example: WordPress and MySQL with Persistent Volumes](/docs/tutorials/stateful-application/mysql-wordpress-persistent-volume/)
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 * [Example: Deploying Cassandra with Stateful Sets](/docs/tutorials/stateful-application/cassandra/)
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 * [Running ZooKeeper, A CP Distributed System](/docs/tutorials/stateful-application/zookeeper/)
 
 ## Services