Fix typo on darknet.py and lm_fyolo.py

[oatawa1]

What this patch does to fix the issue.

Fix comment typo in lm_fyolo.py
Fix RunTImeError msg in darknet.py

Link to any relevant issues or pull requests.

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This PR needs Approvals as follows.

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[iizukak]

OA

[oatawa1]

@iizukak Thanks

[tfujiwar]

Readability Approval

[oatawa1]

@tfujiwar Thanks

[oatawa1]

/ready

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