Add ignore blockless-group docs
Add ignore blockless-group docs

Closes #1461

heatwaveo8/stylelint,hudochenkov/stylelint,heatwaveo8/stylelint,stylelint/stylelint,hudochenkov/stylelint,gaidarenko/stylelint,heatwaveo8/stylelint,stylelint/stylelint,gaidarenko/stylelint,gucong3000/stylelint,stylelint/stylelint,gucong3000/stylelint,gucong3000/stylelint,stylelint/stylelint,hudochenkov/stylelint,gaidarenko/stylelint