integration-docs: Update Hubot for new doc format.

Part of zulip#29592.

templates/zerver/integrations/hubot.md

@@ -1,18 +1,21 @@
+# Zulip Hubot Integration
+
+{start_tabs}
+
 1. Follow the **Getting Started with Hubot** section of the
    [Hubot README](https://hubot.github.com/docs/#getting-started-with-hubot)
    to create your Hubot. You'll have a new directory from
    which `bin/hubot` starts a vanilla Hubot instance with
    the shell backend.
 
-1. In your Hubot's directory, install the Zulip adapter. Run:
-   `npm install --save hubot-zulip`
+1. In your Hubot's directory, install the Zulip adapter by running:
+
+    `npm install --save hubot-zulip`
 
 1. {!create-a-generic-bot.md!}
-   Note its username, API key and full name; you will use them
-   on the next step.
+   Note its full name and API key, as you will need them next.
 
-1. To run Hubot locally, first, set the following environment
-   variables by running:
+1. To run Hubot locally, set the following environment variables:
 
     ```
     export HUBOT_ZULIP_SITE="{{ api_url }}"
@@ -22,22 +25,22 @@
 
     Then, run:
 
-    `bin/hubot --adapter zulip --name "myhubot"`
+    `bin/hubot --adapter zulip --name "<bot username>"`
 
-    The `--name` parameter must match the name you gave the bot on
-    the settings page.
+!!! tip ""
 
-Hubot will automatically listen for commands on all public streams.
-You can also invite Hubot to private streams.
+    Hubot automatically listens for commands on all public channels. Private
+    channels require an invitation.
+
+{end_tabs}
 
 To test your Hubot installation, send it an @-notification with a
-basic command, for example `@Hubot pug me`, which should produce a
+basic command, e.g., `@Hubot pug me`, which should produce a
 result like this:
 
 ![Hubot message](/static/images/integrations/hubot/001.png)
 
-[Source code for the hubot-zulip adapter is available on GitHub][1]
-[1]: https://github.com/zulip/hubot-zulip
+### Related documentation
 
-[Check out all integrations available via Hubot][2]
-[2]: https://github.com/hubot-scripts
+* [The hubot-zulip adapter on GitHub][1]
+[1]: https://github.com/zulip/hubot-zulip