Update articles/application-gateway/mutual-authentication-troubleshooting.md

Co-authored-by: Michael Bender <[email protected]>

Author: Vyshnavi-MSFT

articles/application-gateway/mutual-authentication-troubleshooting.md

@@ -129,7 +129,7 @@ There are two potential causes for this error:
 #### Solution
 
 Based on the specific cause, apply one of the following solutions:
-1. **Format issue:** Ensure the certificate chain is in PEM format with each certificate properly delimited by `-----BEGIN CERTIFICATE-----` and `-----END CERTIFICATE-----` markers. Each certificate should be on separate lines within these delimiters.
+*  **Format issue:** Ensure the certificate chain is in PEM format with each certificate properly delimited by `-----BEGIN CERTIFICATE-----` and `-----END CERTIFICATE-----` markers. Each certificate should be on separate lines within these delimiters.
 2. **Missing data:** Verify that the certificate file contains actual certificate data between the delimiters, not just empty delimiters. 
 
 ### Error code: ApplicationGatewayTrustedClientCertificateDoesNotContainAnyCACertificate