docs: add a note that healthcheck --start-interval requires docker 25.0

Signed-off-by: Jonathan A. Sternberg <[email protected]>
moby · Nov 6, 2023 · d064704 · d064704
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commit d064704
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diff --git a/frontend/dockerfile/docs/reference.md b/frontend/dockerfile/docs/reference.md
@@ -2316,6 +2316,7 @@ However, if a health check succeeds during the start period, the container is co
 started and all consecutive failures will be counted towards the maximum number of retries.
 
 **start interval** is the time between health checks during the start period.
+This option requires Docker Engine version 25.0 or later.
 
 There can only be one `HEALTHCHECK` instruction in a Dockerfile. If you list
 more than one then only the last `HEALTHCHECK` will take effect.