Markdown syntax in docs/adapters.md preventing update of hubot.github.com

[technicalpickles]

We do some magic in the (private) hubot.github.com repo to use this repository as a submodule to get up to date documents. Something about docs/adapter.md is making it unhappy:

The page build failed with the following error:

The file `_submodules/hubot/docs/adapters.md` contains syntax errors. For more information, see https://help.github.com/articles/page-build-failed-markdown-errors.

If you have any questions you can contact us by replying to this email.

I don't see anything obvious wrong. We're using html-pipeline for markdown, so I don't think we can just switch to kramdown. Also, I tried that, and it didn't catch any errors in development...

[technicalpickles]

Kramdown doesn't find it:

irb(main):004:0> Kramdown::Document.new(File.read('docs/adapters.md')).to_html
=> "<hr />\n<p>permalink: /docs/adapters/index.html\nlayout: docs\n—</p>\n\n<p>Adapters are the interface to the service you want your hubot to run on.</p>\n\n<h2 id=\"official-adapters\">Official Adapters</h2>\n\n<p>Hubot includes two official adapters:</p>\n\n<ul>\n  <li><a href=\"/docs/adapters/shell.md\">Shell</a>, i.e. for use with development</li>\n  <li><a href=\"/docs/adapters/campfire.md\">Campfire</a></li>\n</ul>\n\n<h2 id=\"third-party-adapters\">Third-party Adapters</h2>\n\n<p>Third-party adapters are available as <code>npm</code> packages. Here is a list of known\nadapters, but please <a href=\"https://github.com/github/hubot/issues\">submit an issue</a>\nto have yours added to the list:</p>\n\n<ul>\n  <li>\n    <p><a href=\"https://github.com/Hammertime38/hubot-proxy\">Proxy</a> - This adapter allows the base application to observe, handle, and control events sent to the proxied adapter, all defined in a config object at the root of the module.</p>\n  </li>\n  <li><a href=\"https://github.com/shaundubuque/hubot-aim\">AIM</a></li>\n  <li><a href=\"https://github.com/akiomik/hubot-chatwork\">ChatWork</a></li>\n  <li><a href=\"https://github.com/nebulist/hubot-dasher\">Dasher</a></li>\n  <li><a href=\"https://github.com/anroots/hubot-fleep\">Fleep</a></li>\n  <li><a href=\"https://github.com/flowdock/hubot-flowdock\">Flowdock</a></li>\n  <li><a href=\"https://github.com/huafu/hubot-gitter2\">Gitter</a></li>\n  <li><a href=\"https://github.com/atmos/hubot-gtalk\">Gtalk</a></li>\n  <li><a href=\"https://github.com/Hall/hubot-hall\">Hall</a></li>\n  <li><a href=\"https://github.com/hipchat/hubot-hipchat\">HipChat</a></li>\n  <li><a href=\"https://github.com/lazerwalker/hubot-imessage\">iMessage</a></li>\n  <li><a href=\"https://github.com/nandub/hubot-irc\">IRC</a></li>\n  <li><a href=\"https://github.com/smoak/hubot-jabbr\">Jabbr</a></li>\n  <li><a href=\"https://github.com/sdelements/hubot-lets-chat\">Let’s Chat</a></li>\n  <li><a href=\"https://github.com/miyagawa/hubot-lingr\">Lingr</a></li>\n  <li><a href=\"https://github.com/xhan/qqbot\">QQ</a></li>\n  <li><a href=\"https://github.com/iangreenleaf/hubot-partychat-hooks\">Partychat</a></li>\n  <li><a href=\"https://github.com/RocketChat/hubot-rocketchat\">Rocket.Chat</a></li>\n  <li><a href=\"https://github.com/slackhq/hubot-slack\">Slack</a></li>\n  <li><a href=\"https://github.com/netpro2k/hubot-skype\">Skype</a></li>\n  <li><a href=\"https://github.com/sdimkov/hubot-skype-web\">SkypeWeb</a></li>\n  <li><a href=\"https://github.com/unixcharles/hubot-talker\">Talker</a></li>\n  <li><a href=\"https://github.com/lukefx/hubot-telegram\">Telegram</a></li>\n  <li><a href=\"https://github.com/jkarmel/hubot-twilio\">Twilio</a></li>\n  <li><a href=\"https://github.com/MathildeLemee/hubot-twitter\">Twitter</a></li>\n  <li><a href=\"https://github.com/nulab/hubot-typetalk\">Typetalk</a></li>\n  <li><a href=\"https://github.com/victorops/hubot-victorops\">VictorOps</a></li>\n  <li><a href=\"https://github.com/scrumdod/hubot-VSOnline\">Visual Studio Online</a></li>\n  <li><a href=\"https://github.com/markstory/hubot-xmpp\">XMPP</a></li>\n  <li><a href=\"https://github.com/athieriot/hubot-yammer\">Yammer</a></li>\n</ul>\n\n<h2 id=\"writing-your-own-adapter\">Writing Your Own Adapter</h2>\n\n<p>Interested in adding your own adapter? Check out our documentation for <a href=\"/docs/adapters/development.md\">developing adapters</a></p>\n"

[technicalpickles]

This has been fixed ✨