Fix HttpSecurity jee() Javadoc example for mappableRoles

[eleftherias]

Summary

The example configuration in the Javadoc for the jee() method in HttpSecurity incorrectly demonstrates that the parameters for mappableRoles() are prefixed with "ROLE_".

The method implementation of mappableRoles() adds the prefix "ROLE_" to any parameter, therefore if a user were to use the demonstrated configuration, then the list of mappableRoles would be ["ROLE_ROLE_USER", "ROLE_ROLE_ADMIN"].

Actual Behavior

The Javadoc states that mappableRoles are configured as follows:

@Override
protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests().antMatchers("/**").hasRole("USER").and()
        // Example jee() configuration
                        .jee().mappableRoles("ROLE_USER", "ROLE_ADMIN");
}

Expected Behavior

The Javadoc should provide the following example configuration:

@Override
protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests().antMatchers("/**").hasRole("USER").and()
        // Example jee() configuration
                        .jee().mappableRoles("USER", "ADMIN");
 }