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%.

@@ Coverage Diff @@## master #3309 +/- ##
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Coverage 57.99% 57.99% =======================================
Files 302 302 Lines 21764 21764 =======================================
Hits 12621 12621 Misses 8219 8219 Partials 924 924