Cleaning up grammer and wording, avoiding 2nd person

Updating description of encrypted live migration process to avoid 2nd person
perspective, cleaning up grammer and wording to improve clarity.

Change-Id: Ibf0cfac2a4f6c592269c5921397aa3a70c1db4ab
Closes-Bug: #1344374
Merge "Cleaning up grammer and wording, avoiding 2nd person"