### What this PR does / why we need it?
- New section: "Request Forwarding" documentation in
docs/source/tutorials/models/DeepSeek-V3.2.md
- Environment fix: Changed VLLM_ASCEND_ENABLE_FLASHCOMM1 from 0 to 1 in
the DeepSeek-V3 configuration examples
### Does this PR introduce _any_ user-facing change?
Documentation update only - provides new configuration guidance for
request forwarding setups
### How was this patch tested?
- vLLM version: v0.15.0
- vLLM main:
9562912cea
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Signed-off-by: guozr <guozr1997@hotmail.com>
Co-authored-by: guozr <guozr1997@hotmail.com>
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