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docs: installable remove alternate expression flag (#11254)

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8
src/nix/nix.md
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@ -65,7 +65,7 @@ The following types of installable are supported by most commands:
- [Nix file](#nix-file), optionally qualified by an attribute path
- Specified with `--file`/`-f`
- [Nix expression](#nix-expression), optionally qualified by an attribute path
- Specified with `--expr`/`-E`
- Specified with `--expr`
For most commands, if no installable is specified, `.` is assumed.
That is, Nix will operate on the default flake output attribute of the flake in the current directory.
@ -200,17 +200,17 @@ operate are determined as follows:
…
```
For `-e`/`--expr` and `-f`/`--file`, the derivation output is specified as part of the attribute path:
For `--expr` and `-f`/`--file`, the derivation output is specified as part of the attribute path:
```console
$ nix build -f '<nixpkgs>' 'glibc^dev,static'
$ nix build --impure -E 'import <nixpkgs> { }' 'glibc^dev,static'
$ nix build --impure --expr 'import <nixpkgs> { }' 'glibc^dev,static'
```
This syntax is the same even if the actual attribute path is empty:
```console
$ nix build -E 'let pkgs = import <nixpkgs> { }; in pkgs.glibc' '^dev,static'
$ nix build --impure --expr 'let pkgs = import <nixpkgs> { }; in pkgs.glibc' '^dev,static'
```
* You can also specify that *all* outputs should be used using the