### What this PR does / why we need it?
Fix of Pooling Code and Update of Pooling Usage Guide
### Does this PR introduce _any_ user-facing change?
### How was this patch tested?
pr:[[Bugfix]Fixed precision issues caused by pooled request
pooling](https://github.com/vllm-project/vllm-ascend/pull/6049)
readyhttps://github.com/vllm-project/vllm-ascend/pull/6049
read for review
- vLLM version: v0.13.0
- vLLM main:
d68209402d
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Signed-off-by: 房建伟 <fangjianwei@fangjianweideMacBook-Air.local>
Signed-off-by: fangjianwei <f30058701@china.huawei.com>
Signed-off-by: DreamerLeader <88812830+DreamerLeader@users.noreply.github.com>
Co-authored-by: 房建伟 <fangjianwei@fangjianweideMacBook-Air.local>
Co-authored-by: fangjianwei <f30058701@china.huawei.com>