[PROBLEM] Token count example doesn't work with messages with images or tools_calls

[ianchi]

[optional format]

Identify the file to be fixed
How_to_count_tokens_with_tiktoken

Describe the problem
in 6. Counting tokens for chat completions API calls
the function doesn't account for images or for assistant messages with tools calls

Describe a solution
More specific logic should be included

[github-actions]

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