docs: the How to use snippet loads the voice through the model manager; from_hf does not exist

note where the training checkpoint lives

remove the training checkpoint; a verified copy is at /media/hdd16/phoonnx-training-checkpoints/phoonnx_oc_dii_unicode/epoch=748-step=100366.ckpt

replace the sample: the previous one was synthesized with the default voice

add a sample of this voice

docs: correct lineage wording (fine-tuned from closest-language base)

docs: full model card (ownership, usage, datasets)

lang_code -> oc-FR (BCP-47)

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