fix: [doc] MISP-core now working on RHEL 7.9
fix: [doc] MISP-core now working on RHEL 7.9

MISP/MISP,MISP/MISP,SteveClement/MISP,MISP/MISP,MISP/MISP,SteveClement/MISP,SteveClement/MISP,MISP/MISP,SteveClement/MISP,SteveClement/MISP