vale/styles: Update version =>dd Semantic Line Break checking with vale

In our doc guidelines we use "One Sentence Per Line" or more technically
Semantic Line Breaking. Use vale to implement this. This patch also
handles some exceptions with Inc. and e.g. which will contain . but not
apparently at the end of line.

Approved by: carlavilla (mentor)
Differential Revision: https://reviews.freebsd.org/D39560