Search Landmark Example: Remove unnecessary br following h3 (#3313)

Removes an unnecessary `<br>` after the HTML Example `h3`, which was being used in the Search Landmark Example for presentation purposes.

Author: howard-e

content/patterns/landmarks/examples/search.html

@@ -63,7 +63,6 @@ <h2>Design Patterns</h2>
                 <div id="tabpanel2" aria-labelledby="tab2" role="tabpanel" class="tab-pane active">
                   <p>Use the HTML <code>search</code> element to define a <code>search</code> landmark.</p>
                   <h3>HTML Example</h3>
-                  <br>
                   <search>
                     <input type="search" size="20" aria-label="search text"><input type="submit" value="Search">
                   </search>