Adjust Operations Guide Diagrams

Adding width, depth, and centering to adjust the diagrams in
chapter 1 of the operations guide to prevent diagrams
spilling off the page when viewing PDF output.

Change-Id: Ic687f6b117cccb4efe5a53c5f8d2fe9267c21cbb
backport: none
Closes-Bug: #1356055
Merge "Adjust Operations Guide Diagrams"