[doc] chore: Bug fixes for the qwen3-235b model in 256k scenarios

[autbuster]

What does this PR do?

fixes for the qwen3-235b model in 256k scenarios

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[gemini-code-assist]

Code Review

This pull request updates the Qwen3-235B training script to target the Instruct model and GSM8K dataset, alongside adjustments to Megatron parallelism, pipeline layer configurations, and optimizer hyperparameters. A critical configuration error was identified where the expert parallel size (train_ep=16) exceeds the calculated data parallel size (8) for the default 16-node setup, which will cause initialization failure.

[wucong25]

注释删掉