Fix: remove trailing `]` from sfhdr.h
Fix: remove trailing `]` from sfhdr.h

A previous change accidently introduced a trailing `]` in sfhdr.h.

ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz