Server: add missing docblock
Server: add missing docblock

kkkyyy03/scssphp,webdevid/scssphp,g105b/scssphp,webdevid/scssphp,dleffler/scssphp,g105b/scssphp,leafo/scssphp,g105b/scssphp,leafo/scssphp,dleffler/scssphp,leafo/scssphp,dleffler/scssphp,webdevid/scssphp