docs(mattermost): finish channel ordering cleanup

Maintainer edit: move remaining Mattermost documentation mentions to the end of named channel lists.

docs/README.md

@@ -50,7 +50,7 @@ If a local `nanobot agent` session can already answer normally, you can also ask
 | Goal | Read | Outcome |
 |---|---|---|
 | Open the bundled browser UI | [`webui.md`](./webui.md) | `nanobot webui`, chat workspace, Apps, Skills, Automations, and settings |
-| Connect Telegram, Discord, WeChat, Slack, Mattermost, and other apps | [`chat-apps.md`](./chat-apps.md) | A gateway-backed chat channel with access control |
+| Connect Telegram, Discord, WeChat, Slack, Email, Mattermost, or another chat app | [`chat-apps.md`](./chat-apps.md) | A gateway-backed chat channel with access control |
 | Use slash commands and automations | [`chat-commands.md`](./chat-commands.md) | Pairing, model presets, local triggers, heartbeat tasks, and chat-side controls |
 | Generate images | [`image-generation.md`](./image-generation.md) | Image provider config, WebUI image mode, and artifact behavior |
 | Run several isolated bots | [`multiple-instances.md`](./multiple-instances.md) | Separate configs, workspaces, ports, and sessions |

docs/configuration.md

@@ -1950,7 +1950,7 @@ Pairing lets users get access to the bot through a simple code exchange — no c
 
 ### How it works
 
-1. A user sends a DM to the bot on any channel (Telegram, Discord, Slack, Mattermost, etc.) where they aren't yet approved.
+1. A user sends a DM to the bot on any channel (Telegram, Discord, Slack, or Mattermost) where they aren't yet approved.
 2. The bot replies with a pairing code (like `ABCD-EFGH`) and tells them to forward it to you.
 3. You approve the code: