Update index.md (#13741)

* Update index.md

* Style updates

Co-authored-by: Usha Mandya <47779042+usha-mandya@users.noreply.github.com>
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@ -134,7 +134,12 @@ Now that you've run a container, what _is_ a container? Simply put, a container
a sandboxed process on your machine that is isolated from all other processes
on the host machine. That isolation leverages [kernel namespaces and cgroups](https://medium.com/@saschagrunert/demystifying-containers-part-i-kernel-space-2c53d6979504),
features that have been in Linux for a long time. Docker has worked to make these
capabilities approachable and easy to use.
capabilities approachable and easy to use. To summarize, a container:
- is a runnable instance of an image. You can create, start, stop, move, or delete a container using the DockerAPI or CLI.
- can be run on local machines, virtual machines or deployed to the cloud.
- is portable (can be run on any OS)
- Containers are isolated from each other and run their own software, binaries, and configurations.
> **Creating containers from scratch**
>