Update Csharp example to reflect not Key words

[Sdelausnay]

In the plugins page, the CSharp example was still referring to SKFunction instead of Kernel Function.

[learn-build-service-prod[bot]]

Learn Build status updates of commit c5f5fd1:

:warning: Validation status: warnings

File	Status	Preview URL	Details
semantic-kernel/agents/kernel/adding-services.md	:warning:Warning		Details
semantic-kernel/agents/kernel/index.md	:warning:Warning		Details
semantic-kernel/agents/planners/index.md	:warning:Warning		Details
semantic-kernel/agents/plugins/index.md	:warning:Warning		Details
semantic-kernel/agents/plugins/openai-plugins.md	:warning:Warning		Details
semantic-kernel/agents/plugins/using-the-KernelFunction-decorator.md	:warning:Warning		Details
semantic-kernel/overview/index.md	:warning:Warning		Details
semantic-kernel/prompts/calling-nested-functions.md	:warning:Warning		Details
semantic-kernel/prompts/configure-prompts.md	:warning:Warning		Details
semantic-kernel/prompts/saving-prompts-as-files.md	:warning:Warning		Details
semantic-kernel/prompts/templatizing-prompts.md	:warning:Warning		Details
semantic-kernel/prompts/your-first-prompt.md	:warning:Warning		Details

semantic-kernel/agents/kernel/adding-services.md

• Line 43, Column 1: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/dotnet/samples/DocumentationExamples/AIServices.cs" could not be found.
• Line 48, Column 1: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/python/samples/documentation_examples/service_configurator.py" could not be found.
• Line 57, Column 1: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/dotnet/samples/DocumentationExamples/AIServices.cs" could not be found.
• Line 62, Column 1: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/python/samples/documentation_examples/service_configurator.py" could not be found.
• Line 87, Column 1: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/dotnet/samples/DocumentationExamples/AIServices.cs" could not be found.
• Line 92, Column 1: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/python/samples/documentation_examples/service_configurator.py" could not be found.
• Line 101, Column 1: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/dotnet/samples/DocumentationExamples/AIServices.cs" could not be found.
• Line 106, Column 1: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/python/samples/documentation_examples/service_configurator.py" could not be found.

semantic-kernel/agents/kernel/index.md

• Line 45, Column 1: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/dotnet/samples/DocumentationExamples/UsingTheKernel.cs" could not be found.
• Line 49, Column 1: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/dotnet/samples/DocumentationExamples/UsingTheKernel.cs" could not be found.
• Line 55, Column 1: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/python/samples/documentation_examples/service_configurator.py" could not be found.
• Line 59, Column 1: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/python/samples/documentation_examples/using_the_kernel.py" could not be found.
• Line 63, Column 1: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/python/samples/documentation_examples/service_configurator.py" could not be found.
• Line 67, Column 1: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/python/samples/documentation_examples/service_configurator.py" could not be found.
• Line 78, Column 1: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/dotnet/samples/DocumentationExamples/UsingTheKernel.cs" could not be found.
• Line 81, Column 1: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/dotnet/samples/DocumentationExamples/UsingTheKernel.cs" could not be found.
• Line 95, Column 1: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/python/samples/documentation_examples/using_the_kernel.py" could not be found.
• Line 98, Column 1: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/python/samples/documentation_examples/using_the_kernel.py" could not be found.
• Line 101, Column 1: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/python/samples/documentation_examples/using_the_kernel.py" could not be found.

semantic-kernel/agents/planners/index.md

• Line 49, Column 1: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/dotnet/samples/DocumentationExamples/Plugins/MathSolver.cs" could not be found.
• Line 55, Column 5: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/python/samples/documentation_examples/planner.py" could not be found.
• Line 58, Column 5: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/python/samples/documentation_examples/planner.py" could not be found.
• Line 61, Column 5: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/python/samples/documentation_examples/service_configurator.py" could not be found.
• Line 64, Column 5: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/python/samples/documentation_examples/planner.py" could not be found.
• Line 74, Column 1: [Warning: invalid-code] The code snippet "~/../semantic-kernel-samples/dotnet/samples/DocumentationExamples/Plugins/MathSolver.cs" could not be found.

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