chore(docs): clarify comment which was copy&paste from dgeni example

It makes people happy, so why not

Closes #9798
docs(guide/*): fix typos and links

Fix some typos and link-errors introduced in
https://github.com/angular/angular.js/commit/d1ccf176351cda2b49599374c7d4ba594796012f.

Related to #9786
Closes #9800
WIP - chore(changelog): add test for addition of trailing newline

This is still a WIP, since I couldn't run the tests !?