Merge pull request #7212 from miguelius/patch-1

Update startup-order.md

compose/startup-order.md

@@ -54,7 +54,7 @@ script:
     check. For example, you might want to wait until Postgres is definitely
     ready to accept commands:
 
-        #!/bin/bash
+        #!/bin/sh
         # wait-for-postgres.sh
 
         set -e