Fix typo in docs

[hsm207]

Motivation and Context

1. Why is this change required? Fix some typos in the python sample notebooks
2. What problem does it solve? User experience
3. What scenario does it contribute to? A new user reading the docs to learn how to use the project
4. If it fixes an open issue, please link to the issue here. NA

Description

Fix some typos and broken links.

Contribution Checklist

• [x] The code builds clean without any errors or warnings
• [x] The PR follows SK Contribution Guidelines (https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
• [x] The code follows the .NET coding conventions (https://learn.microsoft.com/dotnet/csharp/fundamentals/coding-style/coding-conventions) verified with dotnet format
• [x] All unit tests pass, and I have added new tests where possible
• [x] I didn't break anyone :smile:

[hsm207]

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