verify_proof comments are incorrect

[acolytec3]

I've found 2 issues in the comments for verify_proof that need clarification:

1. This line says that the commitment should be the uncompressed 64 byte representation of the commitment but the actual code that parses the commitment bytes wants 32 bytes (seemingly the serialized/compressed commitment).

2. The z_index parameter says it should be a one byte value between 1-256. Is the underlying code wanting a 1-256 or a zero-indexed value between 0-255?