* nongnu/packages/steam-client.scm: Add comment to top explaining container structure.
(ld.so.conf->ld.so.cache): Replaces names with _.
(nonguix-container->package): Remove container-name, union64, and union32 from let bindings, add newlines to inputs, fix args, and add symlinks for internal-script and manifest.
(make-container-manifest): Improve document string.
(make-container-internal)[synopsis, description]: Fix typos.