Adjust intro to permissions subsection

Author: RebeccaTamachiro

src/content/docs/secrets-store/access-control.mdx

@@ -18,8 +18,9 @@ Refer to the list below for default role definitions.
 - (TBC)**Secrets Store Reporter**: Can view secrets metadata but cannot create, edit, duplicate, nor delete secrets.
 - (TBC)**Secrets Store Deployer**: Can view secrets metadata but cannot create, edit, duplicate, nor delete secrets. Can also [add a Secrets Store binding to a Worker](/secrets-store/integrations/workers/).
 
-## Assign permissions
+## API token permissions
 
-Super Administrators can grant create/edit/delete permissions to other users via the following API call:
+(TBC)
+The following API token permissions can also be used to grant access to Secrets Store resources.
 
-(TBC)
+- *Account - Secrets Store - Read*: