Audit docs for implicit uses of sudo

[callahad]

Our docs use the convention of prefixing commands with # to imply running as root, or $ to imply running as a normal user.

A technical writer should review our docs and make a decision on if and where we should add prose explaining that sudo might be necessary.

(Or add sudo inline? That feels a bit weird to me, since it assumes a lot of things about filesystem permissions, but I'm not a writer.)