Update README.MD

Author: clun

README.MD

@@ -213,7 +213,7 @@ curl -X 'POST' \
   -H 'Content-Type: application/json' \
   -d '{
   "createNamespace": {
-    "name": "cycling"
+    "name": "default_keyspace"
   }
 }'
 ```
@@ -251,4 +251,4 @@ This is an the organization of the different classes of the framework.
 
 - For more information use the [JAVADOC  documentation](https://datastaxdevs.github.io/astra-db-java/latest/)
 
-- The `examples` directory contains more examples on how to use the library.
+- The `examples` directory contains more examples on how to use the library.