[Lint]Style: reformat markdown files via markdownlint (#5884)

### What this PR does / why we need it?
reformat markdown files via markdownlint

- vLLM version: v0.13.0
- vLLM main:
bde38c11df

---------

Signed-off-by: root <root@LAPTOP-VQKDDVMG.localdomain>
Signed-off-by: MrZ20 <2609716663@qq.com>
Co-authored-by: root <root@LAPTOP-VQKDDVMG.localdomain>

docs/source/developer_guide/feature_guide/context_parallel.md

@@ -20,6 +20,7 @@ Its main objective is to eliminate duplicated storage of the KV cache by shardin
 DCP primarily influences the Decode logic, as well as the logic for chunked prefill and cached prefill.
 
 ## How to Use CP?
+
 Please refer to the [context parallel user guide](../../user_guide/feature_guide/context_parallel.md) for detailed information.
 
 ## How It Works?