Adding basic doc comments for System.Math.Sign, System.Math.SinCos, and System.MathF.SinCos

[tannergooding]

This resolves dotnet/runtime#54882

[carlossanlop]

@gewarren first time I see the CI failure "Snippets 5000 / build (pull_request)". The error is:

Error: 😵 Project missing. A project (and optionally a solution file) must be in this directory or one of the parent directories to validate and build this code.
Error: 😵 Project missing. A project (and optionally a solution file) must be in this directory or one of the parent directories to validate and build this code.
Error: Process completed with exit code 1.

The example files already existed before. Should we do something about this or can we ignore it?

[gewarren]

@gewarren first time I see the CI failure "Snippets 5000 / build (pull_request)". The error is:

Error: 😵 Project missing. A project (and optionally a solution file) must be in this directory or one of the parent directories to validate and build this code.
Error: 😵 Project missing. A project (and optionally a solution file) must be in this directory or one of the parent directories to validate and build this code.
Error: Process completed with exit code 1.

The example files already existed before. Should we do something about this or can we ignore it?

@carlossanlop You'll need to add a simple project file to the folder, similar to https://github.com/dotnet/dotnet-api-docs/blob/main/snippets/System.Text/Rune/csharp/RuneSamples.csproj. This is a new requirement to ensure that code samples build correctly. It's already caught some bugs :)

[carlossanlop]

@tannergooding please accept my PR tannergooding#5

I would've pushed directly to this PR branch, but I don't have permission to edit someone's main branch 😞

[carlossanlop]

Note: the csproj is targeting net6.0. Let's hope it builds. 🤞🏼

[carlossanlop]

It's already caught some bugs :)

We can confirm the feature works 😄 @gewarren

[opbld33]

Docs Build status updates of commit f280235:

✅ Validation status: passed

File	Status	Preview URL	Details
samples/snippets/csharp/VS_Snippets_CLR/math.sign/CS/sign.cs	✅Succeeded	View
samples/snippets/csharp/VS_Snippets_CLR/math.sign/System.Math.Sign.csproj	✅Succeeded
samples/snippets/csharp/VS_Snippets_CLR_System/system.Math.SinCos/CS/sincos.cs	✅Succeeded	View
samples/snippets/csharp/VS_Snippets_CLR_System/system.Math.SinCos/System.Math.SinCos.csproj	✅Succeeded
xml/System/Math.xml	✅Succeeded	View
xml/System/MathF.xml	✅Succeeded	View

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

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