.Net: Fix minor typo (#12260)

### Motivation and Context

Fixes a minor typo to be consistent with the other function names 

### Description

### Contribution Checklist

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- [x] The code builds clean without any errors or warnings
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raises no violations
- [x] All unit tests pass, and I have added new tests where possible
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Co-authored-by: Chris <66376200+crickman@users.noreply.github.com>

Author: kkchandi

dotnet/src/SemanticKernel.UnitTests/Functions/KernelFunctionFromPromptTests.cs

@@ -513,7 +513,7 @@ public async Task InvokeAsyncOfTGivesBackTheExpectedResultTypeFromTheConnectorWh
     }
 
     [Fact]
-    public async Task InvokeAsyncOfTGivesBackTheExpectedResultTypeFromTheConnectorWhenStreamingWhenerviceIsOnlyChatCompletionAsync()
+    public async Task InvokeAsyncOfTGivesBackTheExpectedResultTypeFromTheConnectorWhenStreamingWhenServiceIsOnlyChatCompletionAsync()
     {
         var expectedContent = new StreamingChatMessageContent(AuthorRole.Assistant, "Something");
         var mockService = new Mock<IChatCompletionService>();