Add example of using .form-inline with visible <label>s

Refs #15410
[skip sauce]

docs/_includes/css/forms.html

@@ -65,15 +65,43 @@
     <h4>Always add labels</h4>
     <p>Screen readers will have trouble with your forms if you don't include a label for every input. For these inline forms, you can hide the labels using the <code>.sr-only</code> class. There are further alternative methods of providing a label for assistive technologies, such as the <code>aria-label</code>, <code>aria-labelledby</code> or <code>title</code> attribute. If none of these is present, screen readers may resort to using the <code>placeholder</code> attribute, if present, but note that use of <code>placeholder</code> as a replacement for other labelling methods is not advised.</p>
   </div>
+
+  <div class="bs-example" data-example-id="simple-form-inline">
+    <form class="form-inline">
+      <div class="form-group">
+        <label for="exampleInputName2">Name</label>
+        <input type="text" class="form-control" id="exampleInputName2" placeholder="Jane Doe">
+      </div>
+      <div class="form-group">
+        <label for="exampleInputEmail2">Email</label>
+        <input type="email" class="form-control" id="exampleInputEmail2" placeholder="jane.doe@example.com">
+      </div>
+      <button type="submit" class="btn btn-default">Send invitation</button>
+    </form>
+  </div><!-- /example -->
+{% highlight html %}
+<form class="form-inline">
+  <div class="form-group">
+    <label for="exampleInputName2">Name</label>
+    <input type="text" class="form-control" id="exampleInputName2" placeholder="Jane Doe">
+  </div>
+  <div class="form-group">
+    <label for="exampleInputEmail2">Email</label>
+    <input type="email" class="form-control" id="exampleInputEmail2" placeholder="jane.doe@example.com">
+  </div>
+  <button type="submit" class="btn btn-default">Send invitation</button>
+</form>
+{% endhighlight %}
+
   <div class="bs-example" data-example-id="simple-form-inline">
     <form class="form-inline">
       <div class="form-group">
-        <label class="sr-only" for="exampleInputEmail2">Email address</label>
-        <input type="email" class="form-control" id="exampleInputEmail2" placeholder="Enter email">
+        <label class="sr-only" for="exampleInputEmail3">Email address</label>
+        <input type="email" class="form-control" id="exampleInputEmail3" placeholder="Enter email">
       </div>
       <div class="form-group">
-        <label class="sr-only" for="exampleInputPassword2">Password</label>
-        <input type="password" class="form-control" id="exampleInputPassword2" placeholder="Password">
+        <label class="sr-only" for="exampleInputPassword3">Password</label>
+        <input type="password" class="form-control" id="exampleInputPassword3" placeholder="Password">
       </div>
       <div class="checkbox">
         <label>
@@ -86,12 +114,12 @@
 {% highlight html %}
 <form class="form-inline">
   <div class="form-group">
-    <label class="sr-only" for="exampleInputEmail2">Email address</label>
-    <input type="email" class="form-control" id="exampleInputEmail2" placeholder="Enter email">
+    <label class="sr-only" for="exampleInputEmail3">Email address</label>
+    <input type="email" class="form-control" id="exampleInputEmail3" placeholder="Enter email">
   </div>
   <div class="form-group">
-    <label class="sr-only" for="exampleInputPassword2">Password</label>
-    <input type="password" class="form-control" id="exampleInputPassword2" placeholder="Password">
+    <label class="sr-only" for="exampleInputPassword3">Password</label>
+    <input type="password" class="form-control" id="exampleInputPassword3" placeholder="Password">
   </div>
   <div class="checkbox">
     <label>