one more support mail update

cloud-platform.md

@@ -42,4 +42,4 @@ Later versions will contain more enhanced features like
 If you have suggestions about additional use cases and functionality, please feel free to contact us. We appreciate all input from the user community!
 
 ## Contact us:
-[contact@hifis.net](mailto:{{ site.contact_mail }})
+[`{{ site.contact_mail }}`](mailto:{{ site.contact_mail }})