docs(docker-compose): In example dir layout focus on important files

docker-compose/examples/grafana/README.md

@@ -99,14 +99,14 @@ build-context/
 │   ├── docker-data
 │   |   └── config
 │   │       └── grafana.cfg
-│   ├── Dockerfile
-│   └── extras
+│   ├── ...
+│   └── ...
 └── nginx
     ├── docker-data
     |   └── config
     │       └── nginx.cfg
-    ├── Dockerfile
-    └── extras
+    ├── ...
+    └── ...
 ```
 
 When done head back up to [How to run](#how-to-run).

docker-compose/examples/hashicorpvault/README.md

@@ -101,8 +101,8 @@ build-context/
 ├── docker-data
 │   └── config
 │       └── vault.cfg
-├── Dockerfile
-└── extras
+├── ...
+└── ...
 ```
 
 When done head back up to [How to run](#how-to-run).