Correct specification for deprecated `CNB_STACK_ID`

buildpacks / spec

Specification for Cloud Native Buildpacks

https://buildpacks.io

Apache License 2.0

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Closed edmorley closed 6 months ago

edmorley commented 6 months ago

Restores the specification for CNB_STACK_ID to the definition that was used prior to the docs refactor in #335.

Fixes #396.