.Net: Adapted broken link to KernelFunctionStrategies (microsoft#6853)

### Motivation and Context

Links in samples for GettingStartedWithAgents section should work

### Description

fixed broken link in sample for KernelFunctionStrategies

### Contribution Checklist

<!-- Before submitting this PR, please make sure: -->

- [x ] The code builds clean without any errors or warnings
- [ ] The PR follows the [SK Contribution
Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
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raises no violations
- [ ] All unit tests pass, and I have added new tests where possible
- [ x] I didn't break anyone 😄

Author: hadze

dotnet/samples/GettingStartedWithAgents/README.md

@@ -22,7 +22,7 @@ Example|Description
 [Step1_Agent](https://github.com/microsoft/semantic-kernel/blob/main/dotnet/samples/GettingStartedWithAgents/Step1_Agent.cs)|How to create and use an agent.
 [Step2_Plugins](https://github.com/microsoft/semantic-kernel/blob/main/dotnet/samples/GettingStartedWithAgents/Step2_Plugins.cs)|How to associate plug-ins with an agent.
 [Step3_Chat](https://github.com/microsoft/semantic-kernel/blob/main/dotnet/samples/GettingStartedWithAgents/Step3_Chat.cs)|How to create a conversation between agents.
-[Step4_KernelFunctionStrategies](https://github.com/microsoft/semantic-kernel/blob/main/dotnet/samples/Step4_KernelFunctionStrategies/Step1_Agent.cs)|How to utilize a `KernelFunction` as a _chat strategy_.
+[Step4_KernelFunctionStrategies](https://github.com/microsoft/semantic-kernel/blob/main/dotnet/samples/GettingStartedWithAgents/Step4_KernelFunctionStrategies.cs)|How to utilize a `KernelFunction` as a _chat strategy_.
 [Step5_JsonResult](https://github.com/microsoft/semantic-kernel/blob/main/dotnet/samples/GettingStartedWithAgents/Step5_JsonResult.cs)|How to have an agent produce JSON.
 [Step6_DependencyInjection](https://github.com/microsoft/semantic-kernel/blob/main/dotnet/samples/GettingStartedWithAgents/Step6_DependencyInjection.cs)|How to define dependency injection patterns for agents.
 [Step7_OpenAIAssistant](https://github.com/microsoft/semantic-kernel/blob/main/dotnet/samples/GettingStartedWithAgents/Step7_OpenAIAssistant.cs)|How to create an Open AI Assistant agent.