Copyediting

There are a number of tweaks. However, I mainly wanted to replace:

  Each worker must have their own

with:

  Each worker must have its own

so that it no longer reads as though a 9-year-old had written it during remedial lessons for English-as-a-second-language.
Merge pull request #44 from b6393ce9-d324-4fe1-996b-acf82dbc3d53/patch-1

Copyediting docs