message: docs: add useful information to custom transformers
diff: @@ -165,6 +165,10 @@ There is also a `defaultUserTransformer` and `defaultOrganizationTeamTransformer
  You could use these and simply decorate the response from the default
  transformation if you only need to change a few properties.
  +**Attention:**
  +When you use the Events Support with a `TeamTransformer`, you need to ensure your entity will have the
  +annotation `github.com/node-id` with the value from `team.id`. Without this, the `team.edit` event could fail to update
  +
  ### Resolving GitHub users via organization email
  When you authenticate users you should resolve them to an entity within the
  