Clarify that docker secret manages Swarm secrets

[tonistiigi]

docker secret command is a swarm-specific secret implementation where secrets are stored in swarm managers and only made available to services via swarm worker agents. Unfortunately, the command was not put under docker swarm subcommand and therefore leads to confusion when managing other types of secrets(eg. build secrets). Make it clear that these are Swarm secrets without requiring the user to read through the whole documentation.

Signed-off-by: Tonis Tiigi tonistiigi@gmail.com

[codecov-commenter]

Codecov Report

Merging #3309 (aeca213) into master (47e5cfa) will not change coverage.
The diff coverage is 80.00%.

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  Coverage   57.99%   57.99%           
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  Files         302      302           
  Lines       21764    21764           
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  Hits        12621    12621           
  Misses       8219     8219           
  Partials      924      924