The v1.15.0 freeze copied `enterprise/guides/datadog` into the snapshot
for every locale but never linked it in `docs.json`, because the cut
cloned the v1.14.7 nav instead of Edge. This backfills the missing nav
reference in the `en`, `pt-BR`, `ko`, and `ar` v1.15.0 blocks so the
already-shipped page is reachable from the version selector. Pairs with
the `_build_new_entry` fix that prevents future cuts from dropping pages.
e15f5fe9bb