API design: Add "Fedora Linux" label to GET /host_summary (#21733)

For #21409

---------

Co-authored-by: mostlikelee <tim@mostlikelee.com>
Co-authored-by: Tim Lee <timlee@fleetdm.com>

docs/REST API/rest-api.md

@@ -2848,6 +2848,12 @@ Returns the count of all hosts organized by status. `online_count` includes all
       "name": "iPadOS",
       "description": "All iPadOS hosts",
       "label_type": "builtin"
+    },
+    {
+      "id": 15,
+      "name": "Fedora Linux",
+      "description": "All Fedora hosts",
+      "label_type": "builtin"
     }
   ],
   "platforms": [