Update proxy comment (#423)

mapstore/proxy.properties

@@ -17,8 +17,8 @@ defaultStreamByteSize=1024
 # White lists, if defined, limit the requests that are accepted and handled by the proxy. Any request that is not
 # matching a defined whitelist will be rejected.
 
-# hostname whitelist limit the accepted requesting hosts (where the client application is hosted), to avoid the proxy being used by anyone
-# you should set the list to accept only the host(s) where mapstore is deployed
+# hostnameWhitelist defines the accepted target hosts for the internal proxy.
+# The list should be set to the hosts whose CORS headers do not allow direct access
 hostnameWhitelist = demo.geo-solutions.it
 
 # mimetype whitelist limit the accepted values for the contentype header in response from the proxied host