v4: Fix outdated utilites classes

docs/examples/sticky-footer-navbar/index.html

@@ -23,7 +23,7 @@
     <!-- Fixed navbar -->
     <div class="pos-f-t">
       <div class="collapse" id="navbar-header">
-        <div class="container bg-inverse p-a-1">
+        <div class="container bg-inverse p-1">
           <h3>Collapsed content</h3>
           <p>Toggleable via the navbar brand.</p>
         </div>
@@ -54,7 +54,7 @@
 
     <!-- Begin page content -->
     <div class="container">
-      <div class="m-t-1">
+      <div class="mt-1">
         <h1>Sticky footer with fixed navbar</h1>
       </div>
       <p class="lead">Pin a fixed-height footer to the bottom of the viewport in desktop browsers with this custom HTML and CSS. A fixed navbar has been added with <code>padding-top: 60px;</code> on the <code>body &gt; .container</code>.</p>