Update together.md to fix example code errors

[dwcarr]

Fixed a few significant errors that prevent the code from being usable.

• corrected import string for instructor.
• baseUrl changed to baseURL to match the openai type signature.
• Also fixed typo, replacing = with : in the object definition .
• Semicolons have been added. I think this allows for optimal portability of the example code, but I can remove if you are of a different mindset.

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