Incorrect default value on exported `tenantsArrayField` field. Should
have been `tenant` but was using `tenants`. This affected the
multi-tenant example which uses a custom tenants array field.
You would not notice this issue unless you were using:
```ts
tenantsArrayField: {
includeDefaultField: false,
}
```
Fixes https://github.com/payloadcms/payload/issues/11125