specific llvm compiler version in alternative compiler section

Author: ZhaoqiongZ

prototype_source/inductor_windows_cpu.rst

@@ -100,7 +100,7 @@ Intel Compiler
 LLVM Compiler
 ^^^^^^^^^^^^^
 
-#. Download and install `LLVM Compiler <https://github.com/llvm/llvm-project/releases>`_ with Windows x86 version.
+#. Download and install `LLVM Compiler <https://github.com/llvm/llvm-project/releases>`_ and choose win64 version.
 #. Set Windows Inductor Compiler via environment variable ``set CXX=clang-cl`` 
 
 Conclusion