ENGDOCS-2429 (#22032)

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## Description

Adds compose-spec/compose-spec#569

## Related issues or tickets

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- [ ] Technical review
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Author: aevesdocker

content/reference/compose-file/services.md

@@ -1752,7 +1752,7 @@ services:
         target: server.cert
         uid: "103"
         gid: "103"
-        mode: "0440"
+        mode: "0o440"
 secrets:
   server-certificate:
     file: ./server.cert