fix small typo in infra.md (#525)
fix small typo in infra.md (#525)


apex/apex,apex/apex,ianrtracey/apex,ianrtracey/apex,ianrtracey/apex,DaveBlooman/apex,DaveBlooman/apex,apex/apex,llun/apex,llun/apex,llun/apex,apex/apex,apex/apex,llun/apex,llun/apex,ianrtracey/apex,ianrtracey/apex,DaveBlooman/apex,apex/apex,DaveBlooman/apex,DaveBlooman/apex,ianrtracey/apex,DaveBlooman/apex,apex/apex,llun/apex