fix hostname hint for clickhouse creds

Author: lyubov-voloshko

frontend/src/app/components/connect-db/db-credentials-forms/clickhouse-credentials-form/clickhouse-credentials-form.component.html

@@ -9,7 +9,7 @@
         [disabled]="submitting"
         [(ngModel)]="connection.host">
     <mat-hint>
-        E.g. <strong><code>my-test-db.cvfuxe8nltiq.us-east-2.rds.amazonaws.com</code></strong>
+        E.g. <strong><code>my-test-db.eu-west-2.aws.clickhouse.cloud</code></strong>
         <br/>
         Connections from internal IPs (e.g. localhost) are not supported
     </mat-hint>