increase emphasis of level 1 heading underlines
increase emphasis of level 1 heading underlines

This will allow us to introduce level 2 headings underlined by the
hyphen character.

sureshsundriyal/lnav,tstack/lnav,sureshsundriyal/lnav,tstack/lnav,tstack/lnav,sureshsundriyal/lnav,sureshsundriyal/lnav,tstack/lnav