docs(interimElement): improve documentation
docs(interimElement): improve documentation

- improves comments and JSDoc
- this service is still hidden on our docs site though

marekmicek/material,clshortfuse/material,marekmicek/material,oostmeijer/material,bluebirdtech/material,clshortfuse/material,marekmicek/material,angular/material,oostmeijer/material,angular/material,clshortfuse/material,marekmicek/material,angular/material,clshortfuse/material,bluebirdtech/material,bluebirdtech/material,oostmeijer/material,bluebirdtech/material,oostmeijer/material,angular/material