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docs: service create: document non-matching/exclude constraints 

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit b059c93c92)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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Sebastiaan van Stijn 2020-02-10 11:16:22 +01:00
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docs/reference/commandline/service_create.md
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@ -667,7 +667,8 @@ $ docker service create \
### Specify service constraints (--constraint)
You can limit the set of nodes where a task can be scheduled by defining
constraint expressions. Multiple constraints find nodes that satisfy every
constraint expressions. Constraint expressions can either use a _match_ (`==`)
or _exclude_ (`!=`) rule. Multiple constraints find nodes that satisfy every
expression (AND match). Constraints can match node or Docker Engine labels as
follows: