vale/style: Utilize vales vocabulary engine

• Remove spelling-exceptions list
• Vale has it's own engine to add custom vocabulary for adding project specific keywords. Add a vocabulary named Terms
• Add the file accept.txt which words should be accepted without any errors
• Utilize documentation/content/en/books/arch-handbook/mac/_index.adoc as proof of concept to remove all sort of errors/warnings/suggestion.
  • Remove EOLSpace
  • Fix Semantic Line Breakings
  • Add relevant keywords to the new Vocab file accept.txt
  • Some codewords were not marked with single tick ` so mark those properly that spelling engine do not throw errors

Approved by: carlavilla (mentor)
Differential Revision: https://reviews.freebsd.org/D39703