Update README.md

README.md

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 - PGL for [Open Graph Benchmark](https://github.com/snap-stanford/ogb) examples can be find [here](./ogb_exmaples/).
 
-- We add newly graph level operators like GraphPooling and [GraphNormalization](https://arxiv.org/abs/2003.00982) for graph level predictions.
+- We add newly graph level operators like **GraphPooling** and [**GraphNormalization**](https://arxiv.org/abs/2003.00982) for graph level predictions.
 
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