editorial: update mapping of Nix terminology to the SLSA Package model

Change Nix package ecosystem terminology to match definitions of SLSA
Package model terminology. Capitalize Nix to match proper name of
package ecosystem. Map SLSA Package registry to Nixpkgs (the largest
repository of Nix packages [and also a Nix Flake]) and Flakes (distributed repositories of Nix
packages). Map SLSA Package name to attributes of Nixpkgs and Flake
outputs. Map SLSA Package artifact to Nix Store Path.

Signed-off-by: Mark Sisson <5761292+marksisson@users.noreply.github.com>

docs/spec/v1.0-rc2/terminology.md

@@ -219,10 +219,10 @@ additions are welcome!
     <td>Package name
     <td>Package
   <tr>
-    <td><a href="https://nixos.org/guides/how-nix-works.html">nix</a> (e.g. <a href="https://nixos.org/">NixOS</a>)
-    <td><em>?</em>
-    <td><a href="https://nixos.org/manual/nix/stable/glossary.html#gloss-store-object">Store Object</a>?
-    <td>Package or <a href="https://nixos.org/manual/nix/stable/glossary.html#gloss-derivation">Derivation</a>
+    <td><a href="https://nixos.org/guides/how-nix-works.html">Nix</a> (e.g. <a href="https://nixos.org/">NixOS</a>)
+    <td><a href="https://github.com/NixOS/nixpkgs">Nixpkgs</a> / <a href="https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-flake">Flakes</a>
+    <td><a href="https://github.com/NixOS/nixpkgs">Nixpkgs</a> attribute path / <a href="https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-flake">Flake</a> output attribute
+    <td><a href="https://nixos.org/manual/nix/stable/glossary.html#gloss-store-path">Store Path</a>
   <tr>
     <td colspan=4><em>Storage systems</em>
   <tr>

docs/spec/v1.0/terminology.md

@@ -253,10 +253,10 @@ additions are welcome!
     <td>Package name
     <td>Package
   <tr>
-    <td><a href="https://nixos.org/guides/how-nix-works.html">nix</a> (e.g. <a href="https://nixos.org/">NixOS</a>)
-    <td><em>?</em>
-    <td><a href="https://nixos.org/manual/nix/stable/glossary.html#gloss-store-object">Store Object</a>?
-    <td>Package or <a href="https://nixos.org/manual/nix/stable/glossary.html#gloss-derivation">Derivation</a>
+    <td><a href="https://nixos.org/guides/how-nix-works.html">Nix</a> (e.g. <a href="https://nixos.org/">NixOS</a>)
+    <td><a href="https://github.com/NixOS/nixpkgs">Nixpkgs</a> / <a href="https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-flake">Flakes</a>
+    <td><a href="https://github.com/NixOS/nixpkgs">Nixpkgs</a> attribute path / <a href="https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-flake">Flake</a> output attribute
+    <td><a href="https://nixos.org/manual/nix/stable/glossary.html#gloss-store-path">Store Path</a>
   <tr>
     <td colspan=4><em>Storage systems</em>
   <tr>

docs/spec/v1.1/terminology.md

@@ -253,10 +253,10 @@ additions are welcome!
     <td>Package name
     <td>Package
   <tr>
-    <td><a href="https://nixos.org/guides/how-nix-works.html">nix</a> (e.g. <a href="https://nixos.org/">NixOS</a>)
-    <td><em>?</em>
-    <td><a href="https://nixos.org/manual/nix/stable/glossary.html#gloss-store-object">Store Object</a>?
-    <td>Package or <a href="https://nixos.org/manual/nix/stable/glossary.html#gloss-derivation">Derivation</a>
+    <td><a href="https://nixos.org/guides/how-nix-works.html">Nix</a> (e.g. <a href="https://nixos.org/">NixOS</a>)
+    <td><a href="https://github.com/NixOS/nixpkgs">Nixpkgs</a> / <a href="https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-flake">Flakes</a>
+    <td><a href="https://github.com/NixOS/nixpkgs">Nixpkgs</a> attribute path / <a href="https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-flake">Flake</a> output attribute
+    <td><a href="https://nixos.org/manual/nix/stable/glossary.html#gloss-store-path">Store Path</a>
   <tr>
     <td colspan=4><em>Storage systems</em>
   <tr>