You can just play D D/F# G A and so on, but the extra stuff is because the tabs are 
different from those exact chords


Intro: D           Dsus/F#       Gmaj7           Asus

   1 + 2 + 3 + 4 + 1 + 2 + 3 + 4   +
e|-----2-------3-------2-------0------|