Update application-gateway-diagnostics.md

Author: MJyot

articles/application-gateway/application-gateway-diagnostics.md

@@ -118,7 +118,7 @@ The access log is generated only if you've enabled it on each Application Gatewa
 |requestUri| This field contains the URL after the rewrite operation on Application Gateway |
 |upstreamSourcePort| The source port used by Application Gateway when initiating a connection to the backend target|
 |originalHost| This field contains the original request host name|
-|error_info|The reason for the 4xx and 5xx error. If the request failed, one of the error codes described in Error Info codes below is stored in this field of access log|
+|error_info|The reason for the 4xx and 5xx error. If the request failed, one of the error codes described in [Error Info codes](./application-gateway-diagnostics#error-info-codes)  is stored in this field of access log|
 |contentType|The type of content or data that is being processed or delivered by the application gateway