Make profile element names stable

doc/manual/rl-next/nix-profile-names.md

@@ -3,4 +3,6 @@ synopsis: "`nix profile` now allows referring to elements by human-readable name
 prs: 8678
 ---
 
-[`nix profile`](@docroot@/command-ref/new-cli/nix3-profile.md) now uses names to refer to installed packages when running [`list`](@docroot@/command-ref/new-cli/nix3-profile-list.md), [`remove`](@docroot@/command-ref/new-cli/nix3-profile-remove.md) or [`upgrade`](@docroot@/command-ref/new-cli/nix3-profile-upgrade.md) as opposed to indices. Indices are deprecated and will be removed in a future version.
+[`nix profile`](@docroot@/command-ref/new-cli/nix3-profile.md) now uses names to refer to installed packages when running [`list`](@docroot@/command-ref/new-cli/nix3-profile-list.md), [`remove`](@docroot@/command-ref/new-cli/nix3-profile-remove.md) or [`upgrade`](@docroot@/command-ref/new-cli/nix3-profile-upgrade.md) as opposed to indices. Profile element names are generated when a package is installed and remain the same until the package is removed.
+
+**Warning**: The `manifest.nix` file used to record the contents of profiles has changed. Nix will automatically upgrade profiles to the new version when you modify the profile. After that, the profile can no longer be used by older versions of Nix.

src/nix/profile-list.md

@@ -7,14 +7,12 @@ R""(
   ```console
   # nix profile list
   Name:               gdb
-  Index:              0
   Flake attribute:    legacyPackages.x86_64-linux.gdb
   Original flake URL: flake:nixpkgs
   Locked flake URL:   github:NixOS/nixpkgs/7b38b03d76ab71bdc8dc325e3f6338d984cc35ca
   Store paths:        /nix/store/indzcw5wvlhx6vwk7k4iq29q15chvr3d-gdb-11.1
 
   Name:               blender-bin
-  Index:              1
   Flake attribute:    packages.x86_64-linux.default
   Original flake URL: flake:blender-bin
   Locked flake URL:   github:edolstra/nix-warez/91f2ffee657bf834e4475865ae336e2379282d34?dir=blender

src/nix/profile-remove.md

@@ -8,13 +8,6 @@ R""(
   # nix profile remove hello
   ```
 
-* Remove a package by index
-  *(deprecated, will be removed in a future version)*:
-
-  ```console
-  # nix profile remove 3
-  ```
-
 * Remove all packages:
 
   ```console

src/nix/profile-upgrade.md

@@ -15,13 +15,6 @@ R""(
   # nix profile upgrade hello
   ```
 
-* Upgrade a specific package by index
-  *(deprecated, will be removed in a future version)*:
-
-  ```console
-  # nix profile upgrade 0
-  ```
-
 # Description
 
 This command upgrades a previously installed package in a Nix profile,