Fix readthedocs config #1812

Job	Run time
GPU Tests	4m 49s
python 3.9 - Lint	45s
python 3.9 - Type check	4m 58s
python 3.9 - Build	1m 12s
python 3.9 - Style	27s
python 3.9 - Docs	2m 6s
python 3.9 - Test	3m 49s
python 3.9 - Datasets integration	31s
python 3.9 - PyTorch integration	43s
python 3.9 - Transformers integration	1m 31s
python 3.9 - FairScale integration	36s
python 3.9 - W&B integration	4m 36s
python 3.9 - Beaker integration	3m 45s
python 3.9 - Flax integration	3m 51s
python 3.9 - GS integration	1m 10s
python 3.9 - Example - train_lm	1m 18s
python 3.8 - Test	3m 28s
python 3.10 - Test	3m 7s
Release	0s
	42m 42s

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