maybe nitpicky, but I think it's more correct. changed 'and' to 'or'.
added commas, and made some minor wording changes.
edited sentences (and a paragraph break) for clarity.

Some parts in here, I had to reread the text a couple times to make
sure I understood. I think it is clearer the way I've changed it.
Merge pull request #557 from Terrycloth/clarifying-text-in-user-manual

my first few edits to the user manual.