Fix missing quotes (#23242)

Signed-off-by: Shiming Zhang <[email protected]>

Author: wzshiming

docs/deployment/frameworks/dstack.md

@@ -9,7 +9,7 @@ vLLM can be run on a cloud based GPU machine with [dstack](https://dstack.ai/),
 To install dstack client, run:
 
 ```bash
-pip install "dstack[all]
+pip install dstack[all]
 dstack server
 ```