Fix typo in Samples causing error: PlanningException: Create plan err (…

…microsoft#2018)

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I am testing the Samples. I was getting this error:

```
Error: Microsoft.SemanticKernel.Planning.PlanningException: Create plan error: Unable to create plan
---> Microsoft.SemanticKernel.Planning.PlanningException: Invalid plan: Failed to find function 'WriterSkill.Shakespeare' in skill 'WriterSkill'.
at Microsoft.SemanticKernel.Planning.Sequential.SequentialPlanParser.ToPlanFromXml(String xmlString, String goal, SKContext context, Boolean allowMissingFunctions)
at Microsoft.SemanticKernel.Planning.SequentialPlanner.CreatePlanAsync(String goal)
--- End of inner exception stack trace ---
at Microsoft.SemanticKernel.Planning.SequentialPlanner.CreatePlanAsync(String goal)
at Submission#10.<<Initialize>>d__0.MoveNext()
--- End of stack trace from previous location ---
at Microsoft.CodeAnalysis.Scripting.ScriptExecutionState.RunSubmissionsAsync[TResult](ImmutableArray`1 precedingExecutors, Func`2 currentExecutor, StrongBox`1 exceptionHolderOpt, Func`2 catchExceptionOpt, CancellationToken cancellationToken)
```

After fixing the function name, the sample worked as expected.


### Description

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These notes will help understanding how your code works. Thanks! -->

Error when trying to run sample `05-using-the-planner.ipynb`


### Contribution Checklist

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- [ ] 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)
and the [pre-submission formatting
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raises no violations
- [ ] All unit tests pass, and I have added new tests where possible
- [ ] I didn't break anyone 😄

Co-authored-by: Rafael Escoto <ra.escoto@slalom.com>

samples/notebooks/dotnet/05-using-the-planner.ipynb

@@ -169,7 +169,7 @@
     "\n",
     "Rewrite the above in the style of Shakespeare.\n",
     "\"\"\";\n",
-    "var shakespeareFunction = kernel.CreateSemanticFunction(skPrompt, \"shakespeare\", \"ShakespeareSkill\", maxTokens: 2000, temperature: 0.2, topP: 0.5);"
+    "var shakespeareFunction = kernel.CreateSemanticFunction(skPrompt, \"Shakespeare\", \"ShakespeareSkill\", maxTokens: 2000, temperature: 0.2, topP: 0.5);"
    ]
   },
   {