Fix error message in instruction parsing Update parse.rs

[mdqst]

Describe your changes.

Issue in the error handling message within the parse_inst method. The original message incorrectly referred to "passing" the instruction. This could cause confusion, as the method is responsible for parsing instructions, not passing them.

The original message:

"Failed to pass the instruction",

The corrected message:

"Failed to parse the instruction",

This change ensures the error message aligns with the method's actual functionality and avoids confusion during debugging.

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This update clarifies the purpose of the error message and improves the overall developer experience when troubleshooting.