Added note about repo-level delegation for custom property definitions (#49195)

Co-authored-by: Chris Patterson <chrispat@github.com>

Author: sbauer

content/organizations/managing-organization-settings/managing-custom-properties-for-repositories-in-your-organization.md

@@ -39,6 +39,7 @@ You can add custom properties to your organization and set values for those prop
 1. In the "Name" field, type the name you'd like to use for your custom property. The name can't contain spaces.
 1. Optionally, in the "Description" field, fill in a description of your custom property.
 1. Under "Type", select the type of property you'd like to add. This can either be a string or a single select field.
+1. Optionally, you can select **Allow repository actors to set this property**. When enabled, repository users and apps with the repository-level "custom properties" fine-grained permission will be able to set and update the property value for their repository.
 1. Optionally, you can select **Require this property for all repositories** and add a default value. This means that you require that all repositories in your organization have a value for this property. Repositories that don’t have an explicit value for this property will inherit the default value.
 1. Click **Save property**.