Fix headers in aws-ec2 doc.
Fix headers in aws-ec2 doc.

memory/vault,Aloomaio/vault,tallpauley/vault,martin-ducar-gd/vault,doodles526/vault,LolalyLuo/vault,hashicorp/vault,tallpauley/vault,wjam/vault,danielsomerfield/vault,rnaveiras/vault,deverton/hashicorp-vault,Banno/vault,jam-pot/vault,joelthompson/vault,Caiyeon/vault,hartsock/vault,Aloomaio/vault,wjam/vault,kingland/vault,jam-pot/vault,memory/vault,michaelansel/vault,hashicorp/vault,MonsantoCo/vault,jgcallero/vault,hashicorp/vault,hartsock/vault,chrishoffman/vault,kingland/vault,lemondrank/vault,jmhardison/vault,Banno/vault,danielsomerfield/vault,lirao/vault,lirao/vault,chrishoffman/vault,quixoten/vault,quixoten/vault,jmhardison/vault,michaelansel/vault,joelthompson/vault,hashicorp/vault,Caiyeon/vault,rnaveiras/vault,mymercurialsky/vault,joelthompson/vault,cimarron-pistoncloud/vault,peteryhwong/vault,rnaveiras/vault,LolalyLuo/vault,kingland/vault,jmhardison/vault,hashicorp/vault,hartsock/vault,hashicorp/vault,MonsantoCo/vault,mgk/vault,naunga/vault,quixoten/vault,mgk/vault,hartsock/vault,peteryhwong/vault,Aloomaio/vault,hartsock/vault,ryon/vault,joelthompson/vault,rnaveiras/vault,jmhardison/vault,kingland/vault,mgk/vault,quixoten/vault,kingland/vault,martin-ducar-gd/vault,ryon/vault,Aloomaio/vault,mymercurialsky/vault,rnaveiras/vault,mgk/vault,doodles526/vault,lemondrank/vault,cimarron-pistoncloud/vault,deverton/hashicorp-vault,jmhardison/vault,naunga/vault,jgcallero/vault