Update to r40959:

This first patch addresses the following:

• rewording to remove you/we/please/simply/etc./i.e./as well as
• one &os; replacement
• reword sections that mention ISA
• some rewording for redundancy; some areas weren't touched as they need to be completely rewritten
• some ACPI/APM fixups

Reviewed by: bcr
Differential Revision: https://reviews.freebsd.org/D5507