Update api-management-error-handling-policies.md

Change Reason and Message for validate-jwt source for condition "Jwt token is missing in request"

Author: fume

articles/api-management/api-management-error-handling-policies.md

@@ -119,7 +119,7 @@ The following errors are predefined for error conditions that can occur during p
 | ip-filter    | Caller IP is in blocked list                                    | CallerIpBlocked           | Caller IP address is blocked. Access denied.                                                                                         |
 | check-header | Required header not presented or value is missing               | HeaderNotFound            | Header {header-name} was not found in the request. Access denied.                                                                    |
 | check-header | Required header not presented or value is missing               | HeaderValueNotAllowed     | Header {header-name} value of {header-value} is not allowed. Access denied.                                                          |
-| validate-jwt | Jwt token is missing in request                                 | TokenNotFound             | JWT not found in the request. Access denied.                                                                                         |
+| validate-jwt | Jwt token is missing in request                                 | TokenNotPresent             | JWT not present.                                                                                         |
 | validate-jwt | Signature validation failed                                     | TokenSignatureInvalid     | <message from jwt library\>. Access denied.                                                                                          |
 | validate-jwt | Invalid audience                                                | TokenAudienceNotAllowed   | <message from jwt library\>. Access denied.                                                                                          |
 | validate-jwt | Invalid issuer                                                  | TokenIssuerNotAllowed     | <message from jwt library\>. Access denied.                                                                                          |
@@ -186,4 +186,4 @@ For more information working with policies, see:
 -   [Policies in API Management](api-management-howto-policies.md)
 -   [Transform APIs](transform-api.md)
 -   [Policy Reference](./api-management-policies.md) for a full list of policy statements and their settings
--   [Policy samples](./policy-reference.md)
+-   [Policy samples](./policy-reference.md)