adding a reference for data retention policy to the server operator FAQ

Author: saltspell

docs/server-admin-4.7/modules/operator/pages/faq.adoc

@@ -8,7 +8,7 @@
 
 
 ## Does server v4.7 have a data retention policy?
-We do not currently support a defined data retention policy. Data is stored indefinitely on server.
+Data retention for MongoDB and PostgreSQL can be configured by following our guide xref:docs/server-admin-4.7/modules/operator/pages/data-retention.adoc[Data Retention in Server]. 
 
 ## What control is granted over Nomad certificates?
 Full control of the certificates, all the way down to mTLS for Nomad.

docs/server-admin-4.8/modules/operator/pages/faq.adoc

@@ -4,7 +4,7 @@
 :experimental:
 
 ## Does server v4.8 have a data retention policy?
-We do not currently support a defined data retention policy. Data is stored indefinitely on server.
+Data retention for MongoDB and PostgreSQL can be configured by following our guide xref:docs/server-admin-4.8/modules/operator/pages/data-retention.adoc[Data Retention in Server]. 
 
 ## What control is granted over Nomad certificates?
 Full control of the certificates, all the way down to mTLS for Nomad.