add clarifying comment about https://github.com/sagemathinc/cocalc/pull/2160
add clarifying comment about https://github.com/sagemathinc/cocalc/pull/2160

tscholl2/smc,sagemathinc/smc,sagemathinc/smc,sagemathinc/smc,tscholl2/smc,DrXyzzy/smc,tscholl2/smc,DrXyzzy/smc,tscholl2/smc,sagemathinc/smc,tscholl2/smc,DrXyzzy/smc,DrXyzzy/smc