document retry spec #1051

Job	Run time
Docker	21s
Pydantic V1	15s
Compatibility	21s
ubuntu-latest - python 3.8 - Lint	19s
ubuntu-latest - python 3.8 - Type check	23s
ubuntu-latest - python 3.8 - Unit tests	1m 7s
ubuntu-latest - python 3.8 - Doc tests	1m 41s
ubuntu-latest - python 3.8 - Doc tests (B)	1m 16s
ubuntu-latest - python 3.8 - Images	42s
ubuntu-latest - python 3.8 - Jobs	21s
ubuntu-latest - python 3.8 - Experiments	39s
ubuntu-latest - python 3.8 - Datasets	47s
ubuntu-latest - python 3.8 - Sweep example	1m 6s
ubuntu-latest - python 3.8 - Build	23s
ubuntu-latest - python 3.8 - Style	15s
ubuntu-latest - python 3.8 - Docs	29s
Release	0s
	10m 25s

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