fix grammar in new callout

docs/_includes/components/labels.html

@@ -35,6 +35,6 @@
 
   <div class="bs-callout bs-callout-info">
     <h4>Have tons of labels?</h4>
-    <p>Rendering problems can arise when you have dozens of inline labels within a narrow container, each containing it's own <code>inline-block</code> element (like an icon). The way around this is setting <code>display: inline-block;</code>. For context and an example, <a href="https://github.com/twbs/bootstrap/issues/13219">see #13219</a>.</p>
+    <p>Rendering problems can arise when you have dozens of inline labels within a narrow container, each containing its own <code>inline-block</code> element (like an icon). The way around this is setting <code>display: inline-block;</code>. For context and an example, <a href="https://github.com/twbs/bootstrap/issues/13219">see #13219</a>.</p>
   </div>
 </div>