[doc, algo] feat: add Ascend NPU GSPO script for Qwen3-32B in releases/v0.8.0

[chengminhua]

What does this PR do?

Add a canonical Ascend NPU training script for Qwen3-32B GSPO under examples/ascend_extras/gspo_trainer/, and link it from the existing GSPO optimization practice doc.

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[gemini-code-assist]

Code Review

This pull request introduces a new training script, run_qwen3_32b_fsdp.sh, for running GSPO optimization on Qwen3-32B using Ascend NPUs. Additionally, it updates the documentation in gspo_optimization_practice.md to link to this script and correct some references. I have no feedback to provide as there are no review comments.

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