Effect the correct use of "affect".

Effect the correct use of "affect".

Use em dashes instead of " - ".

Use .Em instead of *emphasis*.

Note that securing root indirectly (by securing staff accounts) works
only if direct root access has been limited. [1]

s/hacker/attacker, as done in the handbook. (inspired by [1])

PR:		52878 [1]
Submitted by:	Brian Minard <bminard@flatfoot.ca> [1]