Update security guide after a couple code execution methods were removed
Update security guide after a couple code execution methods were removed

t-morgan/sequel,seeARMS/sequel,freshpay/sequel,nju520/sequel,knut2/sequel,gferguson-gd/sequel,yazshel/sequel,yazshel/sequel,uhoh-itsmaciek/sequel,bigfix/sequel,offshore-safety/sequel,offshore-safety/sequel,mpalmer/sequel,reubano/sequel,nicohvi/sequel,dennis-d/custom_sequel,nicohvi/sequel,seeARMS/sequel,gferguson-gd/sequel,offshore-safety/sequel,Marketcircle/sequel,beni55/sequel,knut2/sequel,t-morgan/sequel,freshpay/sequel,reubano/sequel,davidbegin/sequel,pfarrell/sequel,nju520/sequel,dennis-d/custom_sequel,uhoh-itsmaciek/sequel,beni55/sequel,mpalmer/sequel,davidbegin/sequel,chef/sequel,pfarrell/sequel