Possible error in documentation

Created by: AliceRam

Hi,

When browsing the documentation for the latest version 4.4, I came across an unused class in one of the exemples for the navbar.

The External content exemple contains the pos-f-t class which no longer exists in bootstrap:

<div class="pos-f-t">
  <div class="collapse" id="navbarToggleExternalContent">
    <div class="bg-dark p-4">
      <h5 class="text-white h4">Collapsed content</h5>
      <span class="text-muted">Toggleable via the navbar brand.</span>
    </div>
  </div>
  <nav class="navbar navbar-dark bg-dark">
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarToggleExternalContent" aria-controls="navbarToggleExternalContent" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>
  </nav>
</div>

I took a look at the commit history, and found one stating that it has been renamed to position-fixed.

Thank you