docs(): add tooltip to back to top fab (#9806)
docs(): add tooltip to back to top fab (#9806)

Closes #9805.
miguelcobain/material,bluebirdtech/material,ServiceManagementGroup/material,marekmicek/material,marekmicek/material,ServiceManagementGroup/material,pwistbac/material,ilovett/material,SamDLT/material,Splaktar/material,SamDLT/material,Splaktar/material,hayloft/material,graingert/material,graingert/material,profoundry-us/material,DevVersion/material,imjoeco/material,clshortfuse/material,ilovett/material,daniel-nagy/material,oostmeijer/material,oostmeijer/material,daniel-nagy/material,SamDLT/material,Frank3K/material,ServiceManagementGroup/material,vertazzar/material,miguelcobain/material,imjoeco/material,ServiceManagementGroup/material,daniel-nagy/material,DevVersion/material,oostmeijer/material,pwistbac/material,angular/material,Frank3K/material,pwistbac/material,vertazzar/material,crisbeto/material,miguelcobain/material,angular/material,SamDLT/material,vertazzar/material,imjoeco/material,ilovett/material,hayloft/material,Frank3K/material,angular/material,marekmicek/material,profoundry-us/material,miguelcobain/material,Splaktar/material,clshortfuse/material,bluebirdtech/material,david-gang/material,imjoeco/material,pwistbac/material,Splaktar/material,clshortfuse/material,graingert/material,david-gang/material,oostmeijer/material,david-gang/material,crisbeto/material,clshortfuse/material,david-gang/material,crisbeto/material,Frank3K/material,hayloft/material,profoundry-us/material,bluebirdtech/material,bluebirdtech/material,DevVersion/material,DevVersion/material,vertazzar/material,ilovett/material,crisbeto/material,daniel-nagy/material,angular/material,hayloft/material,profoundry-us/material,graingert/material,marekmicek/material