docs/firewall: remove 'experimental' wording

The firewall features are tested, and while there may be changes, it is
functional, so remove 'experimental'.

Ticket: #9286

doc/userguide/configuration/suricata-yaml.rst

@@ -2858,8 +2858,8 @@ use of.
     vista: []
     windows2k3: []
 
-Suricata as a Firewall options (experimental)
----------------------------------------------
+Suricata as a Firewall options
+------------------------------
 
 It is possible to run Suricata as a firewall.
 Please read :ref:`Firewall Mode Design <firewall mode design>` before using this.

doc/userguide/firewall/firewall-design.rst

@@ -3,8 +3,6 @@
 Firewall Mode Design
 ********************
 
-.. note:: In Suricata 8 the firewall mode is experimental and subject to change.
-
 The firewall mode in Suricata allows the use of a ruleset that has different
 properties than the default "threat detection" rulesets:
 

doc/userguide/firewall/firewall-example.rst

@@ -1,8 +1,6 @@
 Firewall Ruleset Examples
 =========================
 
-.. note:: In Suricata 8 the firewall mode is experimental and subject to change.
-
 HTTP
 ----
 

suricata.yaml.in

@@ -2383,7 +2383,7 @@ reference-config-file: @e_sysconfdir@reference.config
 # threshold-file: @e_sysconfdir@threshold.config
 
 ##
-## Suricata as a Firewall options (experimental)
+## Suricata as a Firewall options
 ##
 firewall:
   # toggle to enable firewall mode