Removed remaining references to Hive

docs/lab-1/README.md

@@ -93,7 +93,7 @@ API: http://172.23.0.4:9090  http://127.0.0.1:9090
 WebUI: http://172.23.0.4:9091 http://127.0.0.1:9091 
 ```
 
-We will be using the console address in the next exercise. Let's check that the Hive metastore is running with the following command:
+We will be using the console address in the next exercise. Let's check that the REST server is running with the following command:
 
 ```sh
 docker logs --tail 50 iceberg-rest
@@ -110,7 +110,7 @@ If the REST service is up and running properly, you should see the below lines s
 ...
 ```
 
-If the Hive metastore is up, the MySQL database also must be up because the metastore requires this on startup.
+If the REST server is up, the PostgreSQL database also must be up because the metastore requires this on startup.
 
 Now, let's check the coordinator node: