Removed section to manually install arrow dependencies

docs/get-started/Velox.md

@@ -13,14 +13,7 @@ common OS and conda env deployment.
 
 Gluten builds with Spark3.2.x and Spark3.3.x now but only fully tested in CI with 3.2.2 and 3.3.1. We will add/update supported/tested versions according to the upstream changes. 
 
-Velox uses the script `scripts/setup-xxx.sh` to install all dependency libraries, but Arrow's dependency libraries are not installed. Velox also requires ninja for compilation.
-So we need to install all of them manually. Also, we need to set up the `JAVA_HOME` env. Currently, **java 8** is required and the support for java 11/17 is not ready.
-
-```bash
-## run as root
-## install gcc and libraries to build arrow
-apt-get update && apt-get install -y sudo locales wget tar tzdata git ccache cmake ninja-build build-essential llvm-11-dev clang-11 libiberty-dev libdwarf-dev libre2-dev libz-dev libssl-dev libboost-all-dev libcurl4-openssl-dev openjdk-8-jdk maven
-```
+we need to set up the `JAVA_HOME` env. Currently, **java 8** is required and the support for java 11/17 is not ready.
 
 **For x86_64**