Docker Swarm Update Command Documentation

1st chunk of `content/reference/cli/docker/swarm/update.md`

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---
datafolder: engine-cli
datafile: docker_swarm_update
title: docker swarm update
aliases:
- /edge/engine/reference/commandline/swarm_update/
- /engine/reference/commandline/swarm_update/
layout: cli
---

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Title: Docker Swarm Update Command Documentation

Summary

This document serves as the command-line reference for the `docker swarm update` command. It notes that the page is automatically generated from Docker's source code and suggests submitting changes through GitHub.