Remove extra parentheses

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[Website](https://deepchem.io/) | [Documentation (master)](https://deepchem.readthedocs.io/en/latest/) | [Colab Tutorial](https://github.com/deepchem/deepchem/tree/master/examples/tutorials) | [Discussion Forum](https://forum.deepchem.io/) | [Gitter](https://gitter.im/deepchem/Lobby)

DeepChem aims to provide a high quality open-source toolchain

that democratizes the use of deep-learning in drug discovery,