Fix redirect: finetuning_torchvision_models → transfer_learning_tutorial

[sjp611]

Fixes #3720

Description

The original tutorial covered Image Classification with hymenoptera_data. Changed redirect from torchvision_tutorial (Object Detection) to transfer_learning_tutorial (same task and dataset).

Checklist

• [x] The issue that is being fixed is referred in the description (see above "Fixes #ISSUE_NUMBER")
• [x] Only one issue is addressed in this pull request
• [x] Labels from the issue that this PR is fixing are added to this pull request
• [x] No unnecessary issues are included into this pull request.