Merge pull request #15887 from StevenBlack/headings-labels

docs>components>labels headings

docs/_includes/components/labels.html

 <div class="bs-docs-section">
   <h1 id="labels" class="page-header">Labels</h1>
 
-  <h3>Example</h3>
+  <h2>Example</h2>
   <div class="bs-example" data-example-id="labels-in-headings">
     <h1>Example heading <span class="label label-default">New</span></h1>
     <h2>Example heading <span class="label label-default">New</span></h2>
@@ -14,7 +14,7 @@
 <h3>Example heading <span class="label label-default">New</span></h3>
 {% endhighlight %}
 
-  <h3>Available variations</h3>
+  <h2>Available variations</h2>
   <p>Add any of the below mentioned modifier classes to change the appearance of a label.</p>
   <div class="bs-example" data-example-id="label-variants">
     <span class="label label-default">Default</span>