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docs: update environment replacement #5144

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Updates the Environment replacement section in the Dockerfile reference.

@tonistiigi tonistiigi requested a review from dvdksn July 10, 2024 16:24
@@ -309,10 +309,10 @@ PS E:\myproject>

## Environment replacement
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I like the update, but it made me realize that we should rephrase this section a little bit more. "Environment variables" specifically means variables set in the system. Build arguments are never set on the system-level, they're interpreted when we're building.

I think s/environment variables/variables/g (within this section) would be an appropriate change to make. (And ## Variable replacement, or maybe ## Variable substitution for the section title.)

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