Correction: Clarify note about stock `crate.yml` file
Correction: Clarify note about stock `crate.yml` file

The stock ``crate.yml` file is shipped with the Linux packages as well as the
tarball distribution. "Stock" works here as an adjective without further
specificity.

Additionally, this change clarifies the paragraph addressing the use of default
users.

crate/crate,crate/crate,crate/crate