Editorial changes in Image Guide

This fixes a couple of typos and similar minor issues.

Change-Id: I7a8e5668c93f813e8b26784e6c4f005ef234bc1b
Clean up edits

bug: #1217137

Change-Id: I554fb7f882fdda75d8dc9687c70ccea07efec82f
author: diane fleming
Merge "Clean up edits"
Merge "Editorial changes in Image Guide"