Revert "email: note that passwordCommand should output '\n'"
Revert "email: note that passwordCommand should output '\n'"

This reverts commit d5bbbbd41d851b587f89f35c93c2a4e47a7969ff.

This was premature, the example will not emit a terminal newline and
it is not clear whether it is a good idea to force this limitation.

rycee/home-manager,rycee/home-manager,rycee/home-manager