.Net: Small typo in example (microsoft#2336)

### Motivation and Context

This fixes a small type in the Console output the RetrieveAsync method
requests "info5" and console says "info1"

### Description

Fix typo:

### Contribution Checklist

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

dotnet/samples/KernelSyntaxExamples/Example15_MemorySkill.cs

@@ -50,7 +50,7 @@ await kernel.RunAsync(memorySaver, new()
         // ========= Test memory remember =========
         Console.WriteLine("========= Example: Recalling a Memory =========");
 
-        var answer = await memorySkill.RetrieveAsync(MemoryCollectionName, "info5", logger: logger);
+        var answer = await memorySkill.RetrieveAsync(MemoryCollectionName, "info1", logger: logger);
         Console.WriteLine("Memory associated with 'info1': {0}", answer);
         /*
         Output: