signtool miss argument /k

### Describe the issue or suggestion

I come across that the parameter `/k` is not described here: https://github.com/dotnet/docs/blob/a354ff9b10547e182683d63b8987ec256e9bd7eb/docs/framework/tools/signtool-exe.md but it is here mentioned: https://learn.microsoft.com/en-us/windows/win32/seccrypto/using-signtool-to-sign-a-file

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#### Document Details

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* ID: 72a4dbac-a145-e79f-121d-3d8df67552b1
* Version Independent ID: 9ea61916-a9db-f23e-4c43-edc06650483d
* Platform ID: 17012f2a-06ef-a445-76dc-ed91d5b09adc
* Content: [SignTool.exe (Sign Tool) - .NET Framework](https://learn.microsoft.com/en-us/dotnet/framework/tools/signtool-exe)
* Content Source: [docs/framework/tools/signtool-exe.md](https://github.com/dotnet/docs/blob/main/docs/framework/tools/signtool-exe.md)
* Service: **dotnet-framework**
* GitHub Login: @gewarren
* Microsoft Alias: **gewarren**