add mixin sassdoc documentation for _modify.scss mixins
add mixin sassdoc documentation for _modify.scss mixins

Connexions/cnx-rulesets,Connexions/cnx-rulesets,Connexions/cnx-recipes,Connexions/cnx-rulesets,Connexions/cte,Connexions/cnx-recipes,Connexions/cnx-recipes,Connexions/cnx-rulesets,Connexions/cte,Connexions/cnx-recipes,Connexions/cnx-recipes