Add v4.5.1 docs (#31409)

docs/4.5/examples/floating-labels/index.html

@@ -5,13 +5,13 @@
     <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
     <meta name="description" content="">
     <meta name="author" content="Mark Otto, Jacob Thornton, and Bootstrap contributors">
-    <meta name="generator" content="Jekyll v4.0.1">
+    <meta name="generator" content="Jekyll v4.1.1">
     <title>Floating labels example · Bootstrap</title>
 
     <link rel="canonical" href="https://getbootstrap.com/docs/4.5/examples/floating-labels/">
 
     <!-- Bootstrap core CSS -->
-<link href="/docs/4.5/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-9aIt2nRpC12Uk9gS9baDl411NQApFmC26EwAOH8WgZl5MYYxFfc+NcPb1dKGj7Sk" crossorigin="anonymous">
+<link href="/docs/4.5/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-VCmXjywReHh4PwowAiWNagnWcLhlEJLA5buUprzK8rxFgeH0kww/aWY76TfkUoSX" crossorigin="anonymous">
 
     <!-- Favicons -->
 <link rel="apple-touch-icon" href="/docs/4.5/assets/img/favicons/apple-touch-icon.png" sizes="180x180">
@@ -48,7 +48,7 @@
   <div class="text-center mb-4">
     <img class="mb-4" src="/docs/4.5/assets/brand/bootstrap-solid.svg" alt="" width="72" height="72">
     <h1 class="h3 mb-3 font-weight-normal">Floating labels</h1>
-    <p>Build form controls with floating labels via the <code>:placeholder-shown</code> pseudo-element. <a href="https://caniuse.com/#feat=css-placeholder-shown">Works in latest Chrome, Safari, and Firefox.</a></p>
+    <p>Build form controls with floating labels via the <code>:placeholder-shown</code> pseudo-element. <a href="https://caniuse.com/#feat=css-placeholder-shown">Works in latest Chrome, Safari, Firefox, and IE 10/11 (prefixed).</a></p>
   </div>
 
   <div class="form-label-group">