update templating design

rendercv/themes/main.j2.tex

@@ -3,13 +3,15 @@
 \begin{document}
     <<header|indent(4)>>
 
-((* for section_title, entries in sections*))
-    <<section_title|indent(4)>>
+((* for section_beginning, entries, section_ending in sections*))
+    <<section_beginning|indent(4)>>
 
     ((* for entry in entries *))
         <<entry|indent(8)>>
 
     ((* endfor *))
+
+    <<section_ending|indent(4)>>
 ((* endfor *))
 
 \end{document}