docs(guide/compiler): fix typo

Closes #4667
docs(guide/compiler): clarify wording

Closes #4668
Clarification stemming from my own issues

It is instructive to give literal examples that reflect common (my) experience of the problem. :)
docs(error/compile/tplrt): clarify and grammar

Closes #4503
docs(error/compile/tplrt): split long lines
docs(guide/unit-testing): fix typo

Closes #4601
docs($location): document $location's events

Closes #1569
Closes #4446