docs(guide/*): improve explanation of strictDi

Closes #9786
Merge branch 'master' of https://github.com/angular/angular.js
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