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Update doc/builders/fetchers.chapter.md

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Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>
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@ -4,7 +4,7 @@ Nixpkgs provides fetchers for different protocols and services. Fetchers are fun
## Caveats
Fetchers create [_fixed output derivations_](https://nixos.org/manual/nix/stable/#fixed-output-drvs) from downloaded files. Later, Nix can reuse the downloaded files via their hash. While the caching improves performance, it can lead to some confusion. For example, consider the following fetcher:
Fetchers create [_fixed output derivations_](https://nixos.org/manual/nix/stable/#fixed-output-drvs) that downloaded files. Later, Nix can reuse the downloaded files via their hash. While the caching improves performance, it can lead to some confusion. For example, consider the following fetcher:
```nix
fetchurl {