[CI:DOCS] fixes indentation of example pod yaml

The example as previously shown would result in "Error: multi doc yaml
could not be split". The change here has been tested to work, and it
matches the example in the [kubernetes
docs](https://kubernetes.io/docs/tasks/configure-pod-container/configure-pod-configmap/#configure-all-key-value-pairs-in-a-configmap-as-container-environment-variables).

Signed-off-by: Michael Hrivnak <mhrivnak@hrivnak.org>

docs/source/markdown/podman-play-kube.1.md

@@ -96,9 +96,9 @@ spec:
     name: container-1
     image: foobar
     envFrom:
-      - configMapRef:
-      name: foo
-      optional: false
+    - configMapRef:
+        name: foo
+        optional: false
 ```
 
 and as a result environment variable `FOO` will be set to `bar` for container `container-1`.