[Docs] Add --prerelease=allow to cookbook uv install commands (#35920)

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

docs/cookbook/autoregressive/Qwen/Qwen3.5.mdx

@@ -97,7 +97,7 @@ SGLang from the main branch is required for Qwen3.5. You can install from source
 
 ```bash Command
 # Install from source
-uv pip install 'git+https://github.com/sgl-project/sglang.git#subdirectory=python'
+uv pip install --prerelease=allow 'git+https://github.com/sgl-project/sglang.git#subdirectory=python'
 
 # Or use Docker (NVIDIA GPUs)
 docker pull lmsysorg/sglang:latest

docs/cookbook/autoregressive/Qwen/Qwen3.6.mdx

@@ -77,10 +77,10 @@ SGLang `>=0.5.10` is required for Qwen3.6. You can install from PyPI, from sourc
 
 ```bash Command
 # Install from PyPI
-uv pip install sglang
+uv pip install --prerelease=allow sglang
 
 # Or install from source
-uv pip install 'git+https://github.com/sgl-project/sglang.git#subdirectory=python'
+uv pip install --prerelease=allow 'git+https://github.com/sgl-project/sglang.git#subdirectory=python'
 
 # Or use Docker (NVIDIA GPUs; also serves the NVFP4 variants)
 docker pull lmsysorg/sglang:latest

docs/cookbook/autoregressive/Qwen/Qwen3.8-27B.mdx

@@ -19,14 +19,14 @@ For all methods and hardware platforms, see the [official SGLang installation gu
 ```bash Command
 pip install --upgrade pip
 pip install uv
-uv pip install sglang
+uv pip install --prerelease=allow sglang
 
 # For the DFLASH2 cells only — DFlash2 selector support is newer than the
 # latest release, so build from the commit those cells were validated on
 # instead of the line above:
 # git clone https://github.com/sgl-project/sglang.git && cd sglang
 # git checkout 1cf2b8c54d81802abc15dcf23a29b9cc687bc01e   # PR #35496
-# uv pip install -e "python[all]"
+# uv pip install --prerelease=allow -e "python[all]"
 ```
 
 Then run the **Python** output of the command panel below in that environment.

docs/cookbook/autoregressive/Qwen/Qwen3.8.mdx

@@ -18,7 +18,7 @@ For all methods and hardware platforms, see the [official SGLang installation gu
 ```bash Command
 pip install --upgrade pip
 pip install uv
-uv pip install sglang
+uv pip install --prerelease=allow sglang
 ```
 
 Then run the **Python** output of the command panel below in that environment.