Small minor edit to ch058_forensicsincident-response

“a” changed to “an”

Change-Id: I750a085fef297f9f218bfd4bf093d2e64d76623e
fixed typo on ch055_security-services-for-instances

Maschine to machine was changed

Change-Id: Ie37c2dbfafd49f6b812b3d6f0905676943d8446b
Merge "fixed typo on ch055_security-services-for-instances"