"9.2. Server Configurations" chapter contains the following excerpt:

[usr@localhost <JBoss_Home>]$ls server/web/deployers
alias-deployers-jboss-beans.xml jbossweb.deployer
ejb3.deployer metadata-deployer-jboss-beans.xml
jboss-aop-jboss5.deployer security-deployer-jboss-beans.xml
jboss-jca.deployer
[usr@localhost <JBoss_Home>]$ls server/web/deployers
ROOT.war jbossweb.sar
ejb3-container-jboss-beans.xml jca-jboss-beans.xml
hdscanner-jboss-beans.xml jmx-console.war
hsqldb-ds.xml jmx-invoker-service.xml
http-invoker.sar security
jboss-local-jdbc.rar transaction-jboss-beans.xml
jboss-xa-jdbc.rar

In here

[usr@localhost <JBoss_Home>]$ls server/web/deployers
ROOT.war jbossweb.sar

server/web/deployers should be server/web/deploy.