Update and comprehensively document Scala symbol format
Update and comprehensively document Scala symbol format

MasseGuillaume/scalameta,olafurpg/scalameta,olafurpg/scalameta,scalameta/scalameta,scalameta/scalameta,scalameta/scalameta,scalameta/scalameta,scalameta/scalameta,MasseGuillaume/scalameta,xeno-by/scalameta,MasseGuillaume/scalameta,olafurpg/scalameta,xeno-by/scalameta,xeno-by/scalameta