docs: remove some references to obsolete docker versions
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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@ -2216,8 +2216,6 @@ are stored currently).
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When the health status of a container changes, a `health_status` event is
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generated with the new status.
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The `HEALTHCHECK` feature was added in Docker 1.12.
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## SHELL
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@ -2342,8 +2340,6 @@ environment variable expansion semantics could be modified.
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The `SHELL` instruction can also be used on Linux should an alternate shell be
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required such as `zsh`, `csh`, `tcsh` and others.
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The `SHELL` feature was added in Docker 1.12.
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## External implementation features
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This feature is only available when using the [BuildKit](#buildkit) backend.
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