DC: add help for cpu settings

Change-Id: I948a6f0825bcb0ea10037958abdb9c34628cf640
DC: add help for performance information

Change-Id: If0ec031dd64b0f4092bafdb405348182eb55388b
DC: add remaining help sections

Change-Id: I50e670e71c63c5b2849610c0917159e912bb317d