This diff cleans up several make check_syntax and make check_structure violations to reduce noise for testing future edits. All pages were validated and working as expected.

2 of the warnings were due to long lines of formatted commands/code. I broke these to two lines to prevent having a scrollbar when viewing the manual and for anyone who may need to convert to PDF or print.

It also fixes 3 incorrectly used images, and one image that was incorrectly sized. This should put us in position to remove several of the old/orphaned images.

Note that there are still lots of inconsistencies across the manual with respect to the pictures of the nodes: some are centered above the description while others are right aligned with the description to the left. We should pick one and standardize.