kbfsedits: clarifying comment on loggedIn entry swap
kbfsedits: clarifying comment on loggedIn entry swap

Suggested by songgao.

Issue: #1633

keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/kbfs,keybase/client