O'Reilly: technical comments in maintenance chapter

This commit addresses the technical comments from O'Reilly in the
Maintenance chapter. Supporting text has been created for certain sets
of commands. Commands and their prompts have also been cleaned up for
consistency.

Change-Id: If4619359e10936e8792f80a759bbbd16af9e9984
Merge "O'Reilly: technical comments in maintenance chapter"