### What this PR does / why we need it?
After removing codepsell a while, we discovered that typo had a problem
correctly recognizing certain misspelled words, so I suggested adding it
back.
- vLLM version: v0.14.1
- vLLM main:
d68209402d
---------
Signed-off-by: wangli <wangli858794774@gmail.com>
### What this PR does / why we need it?
correct the seq length of KV for prefill of GQA and clarify the desc of
block table distribution in developer guide.
- vLLM version: v0.13.0
- vLLM main:
2f4e6548ef
---------
Signed-off-by: QiuChunshuo <qiuchunshuo@huawei.com>
### What this PR does / why we need it?
add developer guide for PCP&DCP
- vLLM version: release/v0.13.0
- vLLM main:
bc0a5a0c08
Signed-off-by: QiuChunshuo <qiuchunshuo@huawei.com>
