Update doc/manual/src/package-management/terminology.md

Co-authored-by: Attila Gulyas <toraritte@gmail.com>
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@ -18,12 +18,10 @@ commands from the `NixOS/nix` implementation.</sup>
directory on another machine, accessed via `ssh` or
served by the `nix-serve` Perl script.
A *binary cache* is a remote store which is not the local store of
any machine. Examples of binary caches include S3 buckets and the
[NixOS binary cache](https://cache.nixos.org). Binary caches use a
disk layout that is different from local stores; in particular, they
keep metadata and signatures in `.narinfo` files rather than in
`/nix/var/nix/db`.
A *binary cache* is a specialized Nix store whose metadata and
signatures are kept in `.narinfo` files rather than in the Nix
database. Examples of binary caches include S3 buckets and the
[NixOS binary cache](https://cache.nixos.org).
A *substituter* is a store other than `/nix/store` from which Nix will
copy a store path instead of building it. Nix will not copy a store