Fix spelling

aleksis/apps/alsijil/templates/alsijil/partials/register_coursebook.html

@@ -86,8 +86,8 @@
             {% endfor %}
           </td>
           <td class="lesson-te">
-            {% if documentation.topic %}
-              {{ doc.teachers.get_teachers_short_names|join:', ' }}
+            {% if doc.topic %}
+              {{ doc.get_teachers_short_names|join:', ' }}
             {% endif %}
           </td>
         </tr>