add: [stix2 export] Added instruction about automation part
add: [stix2 export] Added instruction about automation part

Rafiot/MISP,FIRSTdotorg/MISP,SteveClement/MISP,FIRSTdotorg/MISP,Rafiot/MISP,MISP/MISP,devnull-/MISP,FIRSTdotorg/MISP,SteveClement/MISP,MISP/MISP,devnull-/MISP,devnull-/MISP,MISP/MISP,FloatingGhost/MISP,SteveClement/MISP,FloatingGhost/MISP,Rafiot/MISP,FloatingGhost/MISP,SteveClement/MISP,FIRSTdotorg/MISP,MISP/MISP,devnull-/MISP,SteveClement/MISP,FloatingGhost/MISP,Rafiot/MISP,MISP/MISP