docs: clarify docker system df --format placeholders - #7138
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Document summary-row fields (including Build Cache) and call out that image/container style placeholders like .ID are not valid for the non-verbose formatter. Fixes docker#3749 Signed-off-by: Dean Chen <862469039@qq.com>
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--formatondocker system dfonly formats the summary rows. People keep trying.ID/ image-style fields (often copied from elsewhere) and get confusing template errors.This spells out the real placeholders, includes Build Cache in
.Type, and notes that--verboseignores--format.Fixes #3749