ENGDOCS-1376 (#17406)

compose/extends.md

@@ -62,6 +62,7 @@ services.
 **docker-compose.yml**
 
 ```yaml
+services:
   web:
     image: example/my_web_app:latest
     depends_on:
@@ -81,6 +82,7 @@ host, mounts our code as a volume, and builds the web image.
 **docker-compose.override.yml**
 
 ```yaml
+services:
   web:
     build: .
     volumes:
@@ -109,6 +111,7 @@ repo or managed by a different team).
 **docker-compose.prod.yml**
 
 ```yaml
+services:
   web:
     ports:
       - 80:80
@@ -143,10 +146,11 @@ database backup.
 Start with a **docker-compose.yml**.
 
 ```yaml
+services:
   web:
     image: example/my_web_app:latest
     depends_on:
-    - db
+       db
 
   db:
     image: postgres:latest
@@ -156,6 +160,7 @@ In a **docker-compose.admin.yml** add a new service to run the database
 export or backup.
 
 ```yaml
+services:
   dbadmin:
      build: database_admin/
      depends_on:
@@ -443,7 +448,6 @@ services:
       - ./local:/baz
 ```
 
-
 ## Reference information
 
 [`extends`](compose-file/05-services.md#extends)