Missing minio service name (#2263)

Forgot to mention in example, credits to @allanrogerr

Signed-off-by: pjuarezd <pjuarezd@users.noreply.github.com>

docs/cert-manager.md

@@ -307,7 +307,7 @@ minio.<namespace>
 minio.<namespace>.svc
 minio.<namespace>.svc.<cluster domain>
 *.<tenant-name>-hl.<namespace>.svc.<cluster domain>
-*.<namespace>.svc.<cluster domain>
+*.minio.<namespace>.svc.<cluster domain>
 *.<tenant-name>.minio.<namespace>.svc.<cluster domain>'
 ```