Remove obsolete documentation
Remove obsolete documentation

Haml::Util#human_indentation has been refactored and the 'was' argument
has been removed.

Remove the corresponding rdoc for that argument - it was generating a
warning in yard.

amatsuda/haml,tangposmarvin/haml,tangposmarvin/haml,sideci-sample/sideci-sample-haml,macressler/haml,haml/haml,haml/haml,haml/haml,keithpitty/haml,stanhu/haml,macressler/haml,dg1dd1ngs/haml,haml/haml,nazar-pc/haml,keithpitty/haml,dg1dd1ngs/haml,stanhu/haml,nazar-pc/haml