docs: Fix incorrect FQDN metrics which are disabled by default

This metrics were incorrectly stating that they were enabled by default
which confused users. Fix it to mention they are disabled by default and
must be enabled explicitly via --metrics.

Fixes: 1133bd5 ("docs: Added `Default` column in metrics details")
Fixes: cilium#20255

Signed-off-by: Chris Tarazi <chris@isovalent.com>

Documentation/observability/metrics.rst

@@ -435,14 +435,14 @@ Name                             Labels                           Default    Des
 FQDN
 ~~~~
 
-================================== ================================ =========== ========================================================
-Name                               Labels                           Default     Description
-================================== ================================ =========== ========================================================
-``fqdn_gc_deletions_total``                                         Enabled     Number of FQDNs that have been cleaned on FQDN garbage collector job
-``fqdn_active_names``              ``endpoint``                     Enabled     Number of domains inside the DNS cache that have not expired (by TTL), per endpoint
-``fqdn_active_ips``                ``endpoint``                     Enabled     Number of IPs inside the DNS cache associated with a domain that has not expired (by TTL), per endpoint
-``fqdn_alive_zombie_connections``  ``endpoint``                     Enabled     Number of IPs associated with domains that have expired (by TTL) yet still associated with an active connection (aka zombie), per endpoint
-================================== ================================ =========== ========================================================
+================================== ================================ ============ ========================================================
+Name                               Labels                           Default      Description
+================================== ================================ ============ ========================================================
+``fqdn_gc_deletions_total``                                         Enabled      Number of FQDNs that have been cleaned on FQDN garbage collector job
+``fqdn_active_names``              ``endpoint``                     Disabled     Number of domains inside the DNS cache that have not expired (by TTL), per endpoint
+``fqdn_active_ips``                ``endpoint``                     Disabled     Number of IPs inside the DNS cache associated with a domain that has not expired (by TTL), per endpoint
+``fqdn_alive_zombie_connections``  ``endpoint``                     Disabled     Number of IPs associated with domains that have expired (by TTL) yet still associated with an active connection (aka zombie), per endpoint
+================================== ================================ ============ ========================================================
 
 .. _metrics_api_rate_limiting: