Clarify docs for distributing from macOS clients.
Clarify docs for distributing from macOS clients.

luser/sccache2,mozilla/sccache,glandium/sccache,luser/sccache2,mozilla/sccache,glandium/sccache,mozilla/sccache,luser/sccache2,luser/sccache2,glandium/sccache,glandium/sccache