[docs/examples] Blackwell tutorial 04 (2SM MMA): fix stale B-operand print annotations (the 2x1SM atom splits B N/2-per-CTA) and document the expect-tx pitfalls that deadlock#3314

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docs(cute tutorial 04): fix stale B-operand print annotations (2x1SM atom splits B N/2-per-CTA) and warn about the expect-tx deadlock pitfalls
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