fix broken links in docs/README (#55)

* fix broken links in docs/README

* typo

README.md

@@ -137,4 +137,4 @@ azb spark cluster delete --id <my-cluster-id>
 Please see the samples folder for a curated list of samples from Spark-2.2.0.
 
 ## Next Steps
-You can find more documentation [here](./documentation)
+You can find more documentation [here](./docs)

docs/README.md

@@ -10,5 +10,5 @@ Add custom configuraiton scripts to your cluster.
 ## [Spark Submit](./20-spark-submit.md)
 Submit a Spark job to the cluster.
 
-## [Cloud Storage](./30-cloud-storage)
+## [Cloud Storage](./30-cloud-storage.md)
 Using cloud storage to load and save data to and from persisted data stores.