Update validate-azure-ad-token-policy.md

Added default value for `header-name` attribute. Fixes https://github.com/MicrosoftDocs/azure-docs/issues/103894

Author: dlepow

articles/api-management/validate-azure-ad-token-policy.md

@@ -60,7 +60,7 @@ The `validate-azure-ad-token` policy enforces the existence and validity of a JS
 | Attribute                            | Description                                                                                                                                                                                                                                                                                                                                                                                                                                            | Required                                                                         | Default                                                                           |
 | ------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | -------------------------------------------------------------------------------- | --------------------------------------------------------------------------------- |
 | tenant-id | Tenant ID or URL  of the Azure Active Directory service. | Yes | N/A |
-| header-name                     | The name of the HTTP header holding the token.                                                                                                                                                                                                                                                                                                                                                                                                         | One of `header-name`, `query-parameter-name` or `token-value` must be specified. | N/A                                                                               |
+| header-name                     | The name of the HTTP header holding the token.                                                                                                                                                                                                                                                                                                                                                                                                         | One of `header-name`, `query-parameter-name` or `token-value` must be specified. | `Authorization`                                                                               |
 | query-parameter-name            | The name of the query parameter holding the token.                                                                                                                                                                                                                                                                                                                                                                                                     | One of `header-name`, `query-parameter-name` or `token-value` must be specified. | N/A                                                                               |
 | token-value                     | Expression returning a string containing the token. You must not return `Bearer` as part of the token value.                                                                                                                                                                                                                                                                                                                                           | One of `header-name`, `query-parameter-name` or `token-value` must be specified. | N/A                                                                               |
 | failed-validation-httpcode      | HTTP status code to return if the JWT doesn't pass validation.                                                                                                                                                                                                                                                                                                                                                                                         | No                                                                               | 401                                                                               |