fix: display export format id in error message

[emmanuel-ferdman]

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PR Summary

This small PR evaluates the export format id in error message of google/cloud/aiplatform/models.py. It also fixes a few typos along the way.

[sasha-gitg]

This is making changes to an auto-generated file so we cannot accept this change: https://github.com/googleapis/python-genai/blob/main/google/genai/models.py#L16