[SYCL][Doc] Update source checkout instructions for Windows (#2810)

Align with LLVM's Getting Started document:
https://llvm.org/docs/GettingStarted.html#checkout-llvm-from-git

Author: bader

sycl/doc/GetStartedGuide.md

@@ -63,7 +63,7 @@ set DPCPP_HOME=%USERPROFILE%\sycl_workspace
 mkdir %DPCPP_HOME%
 cd %DPCPP_HOME%
 
-git clone https://github.com/intel/llvm -b sycl
+git clone --config core.autocrlf=false https://github.com/intel/llvm -b sycl
 ```
 
 ## Build DPC++ toolchain