Update Documentation mso_schema_template_bd.py (#58020)

* Update mso_schema_template_bd.py

lib/ansible/modules/network/aci/mso_schema_template_bd.py

@@ -42,8 +42,14 @@ options:
     type: str
   vrf:
     description:
-    - The VRF associated to this BD.
+    - The VRF associated to this BD. This is required only when creating a new BD.
     type: dict
+    suboptions:
+      name:
+        description:
+        - The name of the VRF to associate with.
+        required: true
+        type: str
   subnets:
     description:
     - The subnets associated to this BD.
@@ -111,6 +117,8 @@ EXAMPLES = r'''
     schema: Schema 1
     template: Template 1
     bd: BD 1
+    vrf:
+      name: VRF1
     state: present
   delegate_to: localhost