Delete trailing spaces
Fix misspellings
Use column width of 80 as per manual guidelines. Remove most recurring links to the glossary.
Use less technical N per second, then N Hz to describe the frequency of flashing buttons
Use `Play/Pause button` term, instead just `play
Add section authors and change some wording.
Add label directory that fixes a sphinx warning over a missing :ref: role
Shorten ref link. versionadded label for Cue mode section