Part 2 for fixing #13996: Add a docs callout to help folks using SVG images in IE8-10

docs/_includes/css/images.html

@@ -3,6 +3,10 @@
 
   <h2 id="images-responsive">Responsive images</h2>
   <p>Images in Bootstrap 3 can be made responsive-friendly via the addition of the <code>.img-responsive</code> class. This applies <code>max-width: 100%;</code> and <code>height: auto;</code> to the image so that it scales nicely to the parent element.</p>
+  <div class="bs-callout bs-callout-warning">
+    <h4>SVG images and IE 8-10</h4>
+    <p>In Internet Explorer IE 8-10, SVG images with <code>.img-responsive</code> are disproportionately sized. To fix this, add <code>width: 100% \9;</code> where necessary. Bootstrap doesn't apply this automatically as it causes complications to other image formats.</p>
+  </div>
 {% highlight html %}
 <img src="..." class="img-responsive" alt="Responsive image">
 {% endhighlight %}