fix(docs): correct comment to reflect raw bytes instead of base64

[fehmisener]

This PR updates the field comment for content_bytes to correctly describe its purpose. The comment previously stated that the value was Base64-encoded, but the field type (bytes) indicates it contains raw binary data.

Changes

• Updated the comment to reflect that content_bytes holds raw bytes, not Base64-encoded content.

Reason for Change

The previous comment was misleading and inconsistent with the field’s type annotation. This correction improves clarity and helps prevent confusion for developers using or maintaining the code.

When base64 used instead, I was getting this error below:

APIError
Code: 400
ErrorRequiredPropertyMissing
message: 'Required property is missing.'