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Add a notice for binary PyPI wheel (#3443)

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Installation Guide Installation Guide
================== ==================
**NOTE**. If you are planning to use Python on a Linux system, consider installing XGBoost from a pre-built binary wheel. The wheel is available from Python Package Index (PyPI). You may download and install it by running
```bash
# Ensure that you are downloading xgboost-{version}-py2.py3-none-manylinux1_x86_64.whl
pip3 install xgboost
```
* This package will support GPU algorithms (`gpu_exact`, `gpu_hist`) on machines with NVIDIA GPUs.
* Currently, PyPI has a binary wheel only for 64-bit Linux.
# Building XGBoost from source
This page gives instructions on how to build and install the xgboost package from This page gives instructions on how to build and install the xgboost package from
scratch on various systems. It consists of two steps: scratch on various systems. It consists of two steps: