CLI docs

Signed-off-by: Amit Shukla <amit.shukla@docker.com>
Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

docs/reference/commandline/node_demote.md

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+<!--[metadata]>
++++
+title = "node demote"
+description = "The node demote command description and usage"
+keywords = ["node, demote"]
+[menu.main]
+parent = "smn_cli"
++++
+<![end-metadata]-->
+
+# node demote
+
+    Usage:  docker node demote NODE [NODE...]
+
+    Demote a node as manager in the swarm
+
+Demotes an existing Manager so that it is no longer a manager. This command targets a docker engine that is a manager in the swarm cluster.
+
+
+```bash
+$ docker node demote <node name>
+```
+
+## Related information
+
+* [node accept](node_accept.md)
+* [node reject](node_reject.md)
+* [node promote](node_promote.md)