docker: improve example, docker-image: add a pointer towards docker-rmi (#15709)

Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

pages/common/docker-image.md

@@ -19,3 +19,7 @@
 - Show the history of a local Docker image:
 
 `docker image history {{image}}`
+
+- View documentation for `docker image rm`:
+
+`tldr docker rmi`

pages/common/docker.md

@@ -28,9 +28,9 @@
 
 `docker exec -it {{container_name}} {{sh}}`
 
-- Remove a stopped container:
+- Remove stopped containers:
 
-`docker rm {{container_name}}`
+`docker rm {{container1 container2 ...}}`
 
 - Fetch and follow the logs of a container: