docs(cp): clarify -a sets ownership to the container user - #7173
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Default docker cp keeps source uid/gid. -a/--archive remaps ownership to the container's user instead of "preserving all uid/gid information" as the old wording suggested. Fixes docker#6870 Signed-off-by: Dean Chen <862469039@qq.com>
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docker cp -awas documented as "copy all uid/gid information", which reads like it preserves source ownership. Looking at the daemon path (copyUIDGID→applyTarCopyUserOptions),-aactually remaps ownership to the container user; without it, source uid/gid from the tar are kept.Updated the flag help and the generated reference text to match that.
Fixes #6870