Promoted "document version" section

chb.md

@@ -117,7 +117,7 @@ We wish you every success in your studies.
 
 \vfill
 
-## Document Version
+# Document Version
 
 This document is written for students beginning in the {{years}} academic year. If you did not start in this academic year, please instead refer to the course handbook you received at the start of your studies.