[Fix Doc] Fix broken link (.pdf) for TripletMarginLoss_cn, TripletMarginWithDistanceLoss_cn, triplet_margin_loss_cn, triplet_margin_with_distance_loss_cn, nce_cn#7560

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Echo-Nie merged 2 commits intoPaddlePaddle:developfrom

algorithm1832:fix_pdf_link

Oct 19, 2025

Commits on Oct 17, 2025

fix broken link for paper "Learning shallow convolutional feature descriptors with triplet losses"
algorithm1832
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fix broken link for paper "Noise-contrastive estimation: A new estimation principle for unnormalized statistical models"
algorithm1832
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