[Docs] RTMPose3D

[GaetanoDibenedetto]

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📚 The doc issue

In the usage section, there is a command to try the model, but there is no clear reference to where these files can be found. The file rtmdet_m_640-8xb32_coco-person.py can be easily found via a Google search, but how can the rtmw3d-l_cock14-0d4ad840_20240422.pth file be located?

Suggest a potential alternative/fix

No response