message: Update index.md
  Should be "word"
diff: @@ -61,7 +61,7 @@ The toolkit is designed to provide meaningful building blocks for creating conve
  Most bots do their thing by listening for keywords, phrases or patterns in messages from users. Botkit has a special event handler called `hears()` that makes it easy to configure your bot to listen for this type of trigger.
  ```javascript
  -// listen for a message containing the world "hello", and send a reply
  +// listen for a message containing the word "hello", and send a reply
  controller.hears('hello','message',async(bot, message) => {
  // do something!
  await bot.reply(message, 'Hello human')
  