Add missing closing round bracket in deploy-intro.md

[dkarczmarski]

add missing closing round bracket in deploy-intro.md .

the original sentence in the HTML version was :

"
For your first Deployment, you'll use a hello-node application packaged in a Docker container that uses NGINX to echo back all the requests. (If you didn't already try creating a hello-node application and deploying it using a container, you can do that first by following the instructions from the Hello Minikube tutorial).
"

the clossing braket was probably missed when the <a> was replaced with a MD-style link []().

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