Updated dom_crawler.rst
Voters should refer to authorization, not authentication.

Voters have nothing to do with authentication, only authorization.  I have updated the terminology as such.  I was caught by this when trying to build custom authentication due to the terminology of this page.
Formatting fix and additional example
removed double "the"
Capitalization
[#2636] Backporting syntax fix
Merge branch '2.0' into 2.1
Merge branch '2.1' into 2.2
Merge branch '2.2' into 2.3

Conflicts:
	components/yaml/introduction.rst
Merge branch '2.3'

Conflicts:
	components/yaml/introduction.rst