message: docs(aio): fix typo in attribute-directives
  Closes
diff: @@ -171,7 +171,7 @@ element that hosts an attribute directive, the `<p>` in this case.
  <div class="l-sub-section">
  -Of course you could reach into the DOM with standard JavaScript and and attach event listeners manually.
  +Of course you could reach into the DOM with standard JavaScript and attach event listeners manually.
  There are at least three problems with _that_ approach:
  1. You have to write the listeners correctly.
  