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fix version in compose placement pref example (#6569)

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Trapier Marshall 2018-04-27 12:22:24 -04:00 committed by Gwendolynne Barr
parent 8da12d521a
commit 2a62bcf235
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compose/compose-file/index.md
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@ -646,7 +646,7 @@ in the [swarm](/engine/swarm/) topics.)
Specify placement of constraints and preferences. See the docker service create documentation for a full description of the syntax and available types of [constraints](/engine/reference/commandline/service_create.md#specify-service-constraints-constraint) and [preferences](/engine/reference/commandline/service_create.md#specify-service-placement-preferences-placement-pref).
version: '3'
version: '3.3'
services:
db:
image: postgres