docs: finalize remaining setup heading phrasing (#22543)

* docs: fix thinking link and add reasoning anchor reference

* docs(channels): rename LINE setup heading to onboarding

* docs(channels): normalize Nextcloud Talk onboarding headings

* docs(channels): use onboarding heading for Matrix setup

* docs(channels): standardize Discord onboarding heading

* docs(channels): standardize Telegram onboarding heading

* docs(channels): standardize WhatsApp onboarding heading

* docs(channels): rename iMessage onboarding and configuration sections

* docs(channels): rename Slack onboarding and configuration sections

* docs(channels): rename Signal onboarding heading

* docs(channels): standardize Nostr onboarding and configuration headings

* docs(channels): standardize Zalo onboarding and configuration headings

* docs(channels): standardize Twitch onboarding heading

* docs(channels): standardize Google Chat onboarding heading

* docs(channels): standardize Mattermost onboarding heading

* docs(channels): standardize Zalo Personal onboarding heading

* docs(channels): normalize Discord configuration heading

* docs(channels): standardize Microsoft Teams onboarding heading

* docs(channels): rename Signal configuration reference heading

* docs(channels): rename Matrix configuration reference heading

* docs(channels): normalize WhatsApp configuration heading

* docs(thinking): link reasoning section heading to in-page anchor

* docs(channels): normalize BlueBubbles configuration heading

* docs(channels): normalize Feishu configuration heading

* docs(channels): standardize Signal setup option headings

* docs(channels): refine Twitch setup heading clarity

* docs(channels): simplify Zalo setup heading phrasing

* docs(channels): trim Microsoft Teams minimal setup heading

docs/channels/msteams.md

@@ -236,7 +236,8 @@ This is often easier than hand-editing JSON manifests.
 2. Find the bot in Teams and send a DM
 3. Check gateway logs for incoming activity
 
-## Setup (minimal text-only)
+## Setup (minimal)
+
 
 1. **Install the Microsoft Teams plugin**
    - From npm: `openclaw plugins install @openclaw/msteams`

docs/channels/twitch.md

@@ -67,7 +67,7 @@ Minimal config:
 - Each account maps to an isolated session key `agent:<agentId>:twitch:<accountName>`.
 - `username` is the bot's account (who authenticates), `channel` is which chat room to join.
 
-## Setup (detailed)
+## Setup (detailed, recommended)
 
 ### Generate credentials
 

docs/channels/zalo.md

@@ -53,7 +53,7 @@ It is a good fit for support or notifications where you want deterministic routi
 - DMs share the agent's main session.
 - Groups are not yet supported (Zalo docs state "coming soon").
 
-## Setup (fast path)
+## Setup (quick path)
 
 ### 1) Create a bot token (Zalo Bot Platform)