Docs: updates route-level idle timeout ID (#1206)

updates route-level idle timeout ID

Author: ZPain8464

content/docs/reference/reference.json

@@ -885,7 +885,7 @@
     "path": "/routes/timeouts"
   },
   "route-idle-timeout": {
-    "id": "idle-timeout",
+    "id": "route-idle-timeout",
     "title": "Idle Timeout",
     "path": "/routes/timeouts#idle-timeout",
     "services": ["proxy"],