Added missing html tag in wtforms docs

docs/patterns/wtforms.rst

@@ -82,10 +82,10 @@ Here's an example :file:`_formhelpers.html` template with such a macro:
 .. sourcecode:: html+jinja
 
     {% macro render_field(field) %}
-      <dt>{{ field.label }}
+      <dt>{{ field.label }}</dt>
       <dd>{{ field(**kwargs)|safe }}
       {% if field.errors %}
-        <ul class=errors>
+        <ul class="errors">
         {% for error in field.errors %}
           <li>{{ error }}</li>
         {% endfor %}