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Add a notice for binary PyPI wheel (#3443)

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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
scratch on various systems. It consists of two steps: