Add Fig as an autocomplete method

[brendanfalk]

Proposed changes

Fig provides autocomplete for 300+ CLI tools including Docker, so we would love to have Fig listed as an autocomplete method in your docs. Thanks so much and please let me know if you have any questions!

Related issues (optional)

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[dockertopia]

@brendanfalk thanks for the suggestion, let me check with the team. Could you tell how you got to this page?

[brendanfalk]

@dockertopia thanks for commenting! Docker is one of the most-used commands by Fig users, would love to see Fig listed among the autocomplete options. I got to this page by clicking "edit this page" on the docs online.

[dockertopia]

See https://github.com/docker/docker.github.io/pull/15217#discussion_r951533132.