wtforms: Add missing closing tags in example (#1917)

docs/patterns/wtforms.rst

@@ -82,7 +82,7 @@ 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>
@@ -108,7 +108,7 @@ takes advantage of the :file:`_formhelpers.html` template:
 .. sourcecode:: html+jinja
 
     {% from "_formhelpers.html" import render_field %}
-    <form method=post action="/register">
+    <form method=post>
       <dl>
         {{ render_field(form.username) }}
         {{ render_field(form.email) }}
@@ -116,7 +116,7 @@ takes advantage of the :file:`_formhelpers.html` template:
         {{ render_field(form.confirm) }}
         {{ render_field(form.accept_tos) }}
       </dl>
-      <p><input type=submit value=Register>
+      <p><input type=submit value=Register></p>
     </form>
 
 For more information about WTForms, head over to the `WTForms