Update voice-and-video-logs.md

Adding description for DiagnosticOptions (UI hint)

Author: vriosrada-msft

articles/communication-services/concepts/analytics/logs/voice-and-video-logs.md

@@ -87,6 +87,7 @@ The call summary log contains data to help you identify key properties of all ca
 | `pstnParticipantCallType` | Represents the type and direction of PSTN participants including Emergency calling, direct routing, transfer, forwarding, and so on. | 
 | `ParticipantEndSubCode `| Represents the Calling SDK error subcode that the SDK emits (when relevant) for each `participantId` value. | 
 | `ResultCategory `| Represents the category of the participant ending the call. It can be one of these 4 values: Success, ExpectedError, UnexpectedClientError, UnexpectedServerError. |
+| `DiagnosticOptions `| This value allows developers to attach custom tags to their client telemetry, which can then be viewed in the Call Diagnostics section. This helps in identifying and troubleshooting issues more effectively. |
 
 ### Call diagnostic log schema