Update IPEX version in installation guide documentation (#3342)

update xpu version in installation guide docs

docs/source/guide/get_started/installation.rst

@@ -69,7 +69,7 @@ Follow the `official documentation <https://intel.github.io/intel-extension-for-
 
 .. code-block:: shell
 
-    python -m pip install torch==2.1.0a0 torchvision==0.16.0a0 torchaudio==2.1.0a0 intel-extension-for-pytorch==2.1.10+xpu --extra-index-url https://pytorch-extension.intel.com/release-whl/stable/xpu/us/
+    python -m pip install torch==2.1.0.post0 torchvision==0.16.0.post0 torchaudio==2.1.0.post0 intel-extension-for-pytorch==2.1.20+xpu oneccl_bind_pt==2.1.200+xpu --extra-index-url https://pytorch-extension.intel.com/release-whl/stable/xpu/us/
 
 3. Install MMCV.
 It is required to install mmcv from source to properly build it with IPEX.