Created guide for docker kill command. (#18795)

* Created guide for docker kill command.

* Updated subheading for consistency.

client/src/pages/guide/english/docker/docker-kill/index.md

@@ -0,0 +1,28 @@
+---
+title: Docker kill
+---
+
+## Docker kill
+
+`docker kill` kills one or more running Docker containers by names or IDs.
+
+The basic usage is:
+
+```
+docker kill mycontainer
+```
+
+Or with container ID:
+
+```
+docker kill 769b9341d937
+```
+
+To kill more than one container, container names or IDs must be added with a whitespace character between them:
+
+```
+docker kill mycontainer mysecondcontainer mythirdcontainer
+```
+
+#### More Information:
+- [Docker CLI docs: kill](https://docs.docker.com/engine/reference/commandline/kill/)