Add documentation for configuration feature
Add documentation for configuration feature

Change-Id: I7711d43d064649881987c4a8f81d3d5a029c2e61
Reviewed-on: http://gerrit.causes.com/40438
Tested-by: jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@causes.com>
Reviewed-by: Shane da Silva <67fb7bfe39f841b16a1f86d3928acc568d12c716@brigade.com>

skateman/haml-lint,mzp/haml-lint