Minor typesetting fixes in sections 3.5 to 3.8
This is a very small series of changes. I mainly want to test the waters and see if merge requests are still being considered in this repository. If so then I might collect a larger batch of fixes for another merge request.
I am reading through parts of the text and I figured I might as well fix typos along the way.
Typesetting fixes:
- Hyphens being spaced as minus signs
- Spurious symbols and subscript grouping errors
- Symbols not being in math mode
Also fixed minor phrasing in a garbled paragraph.