Fixed comment

Author: kushagraThapar

src/main/java/com/azure/cosmos/examples/diagnostics/async/CosmosDiagnosticsQuickStartAsync.java

@@ -98,7 +98,7 @@ public void handleDiagnostics(CosmosDiagnosticsContext diagnosticsContext, Conte
         cosmosClientTelemetryConfig.diagnosticsHandler(cosmosDiagnosticsHandler);
         cosmosClientTelemetryConfig.diagnosticsThresholds(cosmosDiagnosticsThresholds);
 
-        //  Create sync client
+        //  Create async client
         client = new CosmosClientBuilder()
             .endpoint(AccountSettings.HOST)
             .key(AccountSettings.MASTER_KEY)