docs(mdThemingProvider): add missing documentation (#11209)
docs(mdThemingProvider): add missing documentation (#11209)

the APIs were covered some in the guide, but not in the service docs
update existing docs for consistency

Relates to #2965. Relates to #9475. Relates to #9476.
Relates to #10458. Relates to #10458.
vertazzar/material,miguelcobain/material,Splaktar/material,oostmeijer/material,angular/material,ServiceManagementGroup/material,bluebirdtech/material,ServiceManagementGroup/material,angular/material,vertazzar/material,ServiceManagementGroup/material,oostmeijer/material,clshortfuse/material,bluebirdtech/material,hayloft/material,bluebirdtech/material,hayloft/material,ServiceManagementGroup/material,clshortfuse/material,angular/material,marekmicek/material,vertazzar/material,angular/material,hayloft/material,hayloft/material,vertazzar/material,clshortfuse/material,miguelcobain/material,Splaktar/material,marekmicek/material,Splaktar/material,marekmicek/material,bluebirdtech/material,oostmeijer/material,clshortfuse/material,miguelcobain/material,Splaktar/material,miguelcobain/material,oostmeijer/material,marekmicek/material