Fix misleading sentence

[ericauld]

Is this a docs issue?

• [X] My issue is about the documentation content or website

Type of issue

Information is incorrect

Description

Just learning this stuff, but the sentence

"Contents of the cache directories persists between builder invocations without invalidating the instruction cache."

confused me, because it sounded like it was saying that the cache directories themselves would normally be the thing which invalidates the instruction cache.

Location

https://docs.docker.com/engine/reference/builder/

Suggestion

Old: "Contents of the cache directories persists between builder invocations without invalidating the instruction cache."

New: "Contents of the cache directories persists between builder invocations even if the instruction cache is invalidated by a change in an earlier layer."

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