Insert a missing </button>.

Commit ready for merge.
 - Legacy-Id: 19468

Author: larseggert

ietf/templates/doc/search/search_form.html

@@ -7,7 +7,7 @@
   <div class="input-group search_field">
     {{ form.name|add_class:"form-control"|attr:"placeholder:Document name/title/RFC number" }}
     <span class="input-group-btn">
-      <button class="btn btn-primary" type="submit">
+      <button class="btn btn-primary" type="submit"></button>
 	<span class="fa fa-search"></span>
 	Search
       </button>
@@ -149,5 +149,4 @@
       </div>
     </div>
   </div>
-</form>
-
+</form>