CLI docs

Signed-off-by: Amit Shukla <amit.shukla@docker.com>
Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
Upstream-commit: 9acf97b72a4d5ff7b1bcad36fb19b53775f01596
Component: engine

components/engine/docs/reference/commandline/node_update.md

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+<!--[metadata]>
++++
+title = "node update"
+description = "The node update command description and usage"
+keywords = ["resources, update, dynamically"]
+[menu.main]
+parent = "smn_cli"
++++
+<![end-metadata]-->
+
+**Warning:** this command is part of the Swarm management feature introduced in Docker 1.12, and might be subject to non backward-compatible changes.
+
+## update
+
+    Usage: docker node update [OPTIONS] Node
+
+    Update a node
+
+
+
+## Related information
+
+* [node inspect](node_inspect.md)
+* [node tasks](node_tasks.md)
+* [node ls](node_ls.md)
+* [node rm](node_rm.md)