nix-channel documentation: don't suggest deprecated function
Running `nix-instantiate --eval -E '(import <nixpkgs> {}).lib.nixpkgsVersion` emits a warning ``` trace: `lib.nixpkgsVersion` is deprecated, use `lib.version` instead! ```
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@ -112,13 +112,13 @@ $ nix-env -iA nixpkgs.hello</screen>
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<para>You can revert channel updates using <option>--rollback</option>:</para>
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<screen>
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$ nix-instantiate --eval -E '(import <nixpkgs> {}).lib.nixpkgsVersion'
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$ nix-instantiate --eval -E '(import <nixpkgs> {}).lib.version'
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"14.04.527.0e935f1"
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$ nix-channel --rollback
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switching from generation 483 to 482
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$ nix-instantiate --eval -E '(import <nixpkgs> {}).lib.nixpkgsVersion'
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$ nix-instantiate --eval -E '(import <nixpkgs> {}).lib.version'
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"14.04.526.dbadfad"
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</screen>
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