Book: Security architecture in revision 864568d5
Section: 2.6.5. Default Set of Implementations

Issue description:
Name of section 2.6.5. Default Set of Implementations does not imply what this section actually includes. It does not include default set of implementations in the elytron subsystem but it includes basic description of every resource in elytron subsystem.

Suggestion for improvement:
Change name of this section to something like "Elytron resources in subsystem". Also sentence "JBoss EAP provides a default set of implementations in the elytron subsystem." should be changed in this way.