Image and related text updates.
Some associated rST markup changes for consistency.
Updates for patchset 1 review comments.
Substantial new content to better cover Horizon usage.
Updates for patchset 3 review comments.
Updates for patchset 4 review comments.
Updates for patchset 5 review comments.
Fix typo.
Fix numbering in procedures.
Updates for patchset 8 review comments.
Clarified **Subcloud** option description.
Remove redundant sentence.
Changes to image usage to remove duplication.
Signed-off-by: Ron Stone <ronald.stone@windriver.com>
Change-Id: I53d93b93629851c07d0cd95ef1fb9c6f3fd9a0a5