Improve clarity and user guidance in the Teleprompter Console App tutorial

[Copilot]

Summary

This PR implements several improvements to the Teleprompter Console App tutorial based on user feedback in issue #25876. The changes focus on making the tutorial clearer and more user-friendly, particularly around the async programming sections where users reported confusion.

Changes Made

1. Enhanced dotnet new console example

Added a concrete command prompt example showing the complete interaction:

E:\development\VSprojects>mkdir teleprompter
E:\development\VSprojects>cd teleprompter
E:\development\VSprojects\teleprompter>dotnet new console
The template "Console Application" was created successfully.
...

2. Improved async Task flow explanation

• Moved the paragraph about creating the RunTeleprompter task to the appropriate section where it's actually implemented
• Changed "Write one final Task..." to "Create a RunTelePrompter task..." for clarity

3. Better TelePrompterConfig.cs file creation guidance

• Added specific filename suggestion: "For example TelePrompterConfig.cs"
• Included the using static System.Math; statement directly in the code block
• Updated wording from "You'll also need to add a using static statement..." to "Note the using static statement allows you to..."

4. Enhanced method parameter explanation

Added clarification about the config object parameter passing:

"The config object is being passed as a parameter to these methods. Use copy/paste to completely replace the methods with the new code here. You can see the code is using attributes and calling methods from the config object."

5. Removed confusing content

Removed the potentially confusing sentence: "This new version of ShowTeleprompter calls a new method in the TeleprompterConfig class."

Impact

These changes address the specific pain points mentioned in the issue where users missed parameter changes and had difficulty following the async programming flow. The tutorial now provides clearer step-by-step guidance with concrete examples and better explanations of the code structure.

Fixes #25876

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Internal previews

📄 File	🔗 Preview link
docs/csharp/tutorials/console-teleprompter.md	Console app

[BillWagner]

@copilot Please start working on this again

[BillWagner]

@copilot Can you start working on this again?

[BillWagner]

@copilot Can you start working on this again?

[BillWagner]

This LGTM. I'll mark it ready for final review.