Added some standards
Merge pull request #2994 from WouterJ/namespace_standards

Added some doc standards
[#2994] Small tweaks to new standards
Merge branch '2.0' into 2.1
Merge branch '2.1' into 2.2

Conflicts:
	contributing/documentation/standards.rst
Merge branch '2.2' into 2.3
Merge branch '2.3'