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doc: change allowInsecurePredicate example to a useful one (#356937)

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6
doc/using/configuration.chapter.md
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@ -154,11 +154,13 @@ There are several ways to tweak how Nix handles a package which has been marked
The `allowInsecurePredicate` option is a function which accepts a package and returns a boolean, much like `allowUnfreePredicate`.
The following configuration example only allows insecure packages with very short names:
The following configuration example allows any version of the `ovftool` package:
```nix
{
allowInsecurePredicate = pkg: builtins.stringLength (lib.getName pkg) <= 5;
allowInsecurePredicate = pkg: builtins.elem (lib.getName pkg) [
"ovftool"
];
}
```