[gnome-user-docs] gnome-help: Remove Firestarter. It's dead. No release for 15 years.

[Andre Klapper <aklapper src gnome org>]

commit 9e62579ad0476407a4a675db8461315d7275adf8
Author: Andre Klapper <a9016009 gmx de>
Date:   Sun Nov 22 16:56:37 2020 +0100

    gnome-help: Remove Firestarter. It's dead. No release for 15 years.

 gnome-help/C/net-firewall-on-off.page | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/gnome-help/C/net-firewall-on-off.page b/gnome-help/C/net-firewall-on-off.page
index 6429c277..08510ee8 100644
--- a/gnome-help/C/net-firewall-on-off.page
+++ b/gnome-help/C/net-firewall-on-off.page
@@ -50,8 +50,7 @@
     <item>
       <p>Go to <gui>Activities</gui> in the top left corner of the screen and
       start your firewall application. You may need to install a firewall
-      manager yourself if you can’t find one (for example, Firestarter or
-      GUFW).</p>
+      manager yourself if you can’t find one (for example, GUFW).</p>
     </item>
     <item>
       <p>Open or disable the port for your network service, depending on