docs: align node transport with gateway ws

docs/gateway/multiple-gateways.md

@@ -13,7 +13,7 @@ Most setups should use one Gateway because a single Gateway can handle multiple
 - `CLAWDBOT_STATE_DIR` — per-instance sessions, creds, caches
 - `agents.defaults.workspace` — per-instance workspace root
 - `gateway.port` (or `--port`) — unique per instance
-- Derived ports (bridge/browser/canvas) must not overlap
+- Derived ports (browser/canvas) must not overlap
 
 If these are shared, you will hit config races and port conflicts.
 
@@ -47,7 +47,7 @@ Run a second Gateway on the same host with its own:
 
 This keeps the rescue bot isolated from the main bot so it can debug or apply config changes if the primary bot is down.
 
-Port spacing: leave at least 20 ports between base ports so the derived bridge/browser/canvas/CDP ports never collide.
+Port spacing: leave at least 20 ports between base ports so the derived browser/canvas/CDP ports never collide.
 
 ### How to install (rescue bot)
 
@@ -73,7 +73,6 @@ clawdbot --profile rescue gateway install
 
 Base port = `gateway.port` (or `CLAWDBOT_GATEWAY_PORT` / `--port`).
 
-- `bridge.port = base + 1`
 - `browser.controlUrl port = base + 2`
 - `canvasHost.port = base + 4`
 - Browser profile CDP ports auto-allocate from `browser.controlPort + 9 .. + 108`