Fix jinja template

Author: uribench

config/templates/README.md

@@ -0,0 +1,5 @@
+# Templates Files
+
+The composition of the `index.md` files that are placed inside each tree node directory of the 
+handbook navigation tree is done using Jinja2 template engine with a custom 
+[template file](/config/templates/index-template.j2).

config/templates/navigation-file-template.j2

@@ -17,13 +17,13 @@
 
 {% for g in guides -%}
 - {{g}}
-{% endfor -%}
+{% endfor %}
 {% endif -%}
 
 {% if topics is defined and topics -%}
 ## Topics
 
 {% for t in topics -%}
 - {{t}}
-{% endfor -%}
+{% endfor %}
 {% endif -%}