DOC Minor rephrasing in the combine doc (#330)
DOC Minor rephrasing in the combine doc (#330)

* minor rephrasing in the combine doc

* Update combine.rst

glemaitre/UnbalancedDataset,glemaitre/UnbalancedDataset,scikit-learn-contrib/imbalanced-learn,fmfn/UnbalancedDataset,fmfn/UnbalancedDataset,scikit-learn-contrib/imbalanced-learn