fixed some issues in the Ajax authentication docs
fixed some issues in the Ajax authentication docs

codeconsole/grails-spring-security-core,grails-plugins/grails-spring-security-core,codeconsole/grails-spring-security-core,tcrossland/grails-spring-security-core,tcrossland/grails-spring-security-core,tcrossland/grails-spring-security-core,grails-plugins/grails-spring-security-core,tcrossland/grails-spring-security-core