fix(doctor): explain discord streaming opt-in (#52450)

docs/channels/discord.md

@@ -582,6 +582,7 @@ Default slash command settings:
     OpenClaw can stream draft replies by sending a temporary message and editing it as text arrives.
 
     - `channels.discord.streaming` controls preview streaming (`off` | `partial` | `block` | `progress`, default: `off`).
+    - Default stays `off` because Discord preview edits can hit rate limits quickly, especially when multiple bots or gateways share the same account or guild traffic.
     - `progress` is accepted for cross-channel consistency and maps to `partial` on Discord.
     - `channels.discord.streamMode` is a legacy alias and is auto-migrated.
     - `partial` edits a single preview message as tokens arrive.

docs/gateway/configuration-reference.md

@@ -179,7 +179,7 @@ WhatsApp runs through the gateway's web channel (Baileys Web). It starts automat
       historyLimit: 50,
       replyToMode: "first", // off | first | all
       linkPreview: true,
-      streaming: "partial", // off | partial | block | progress (default: off)
+      streaming: "partial", // off | partial | block | progress (default: off; opt in explicitly to avoid preview-edit rate limits)
       actions: { reactions: true, sendMessage: true },
       reactionNotifications: "own", // off | own | all
       mediaMaxMb: 100,