Docs: update Installation and Auto-provisioning GPUs. (#2850) #11360

Job	Run time
python-test (3.8, tests/unit_tests)	5m 25s
python-test (3.8, tests/test_api.py)	2m 37s
python-test (3.8, tests/test_cli.py)	2m 54s
python-test (3.8, tests/test_config.py)	2m 51s
python-test (3.8, tests/test_global_user_state.py)	2m 34s
python-test (3.8, tests/test_jobs.py)	2m 58s
python-test (3.8, tests/test_list_accelerators.py)	2m 43s
python-test (3.8, tests/test_optimizer_dryruns.py)	4m 24s
python-test (3.8, tests/test_optimizer_random_dag.py)	3m 44s
python-test (3.8, tests/test_storage.py)	2m 35s
python-test (3.8, tests/test_wheels.py)	2m 38s
python-test (3.8, tests/test_spot.py)	3m 21s
python-test (3.8, tests/test_yaml_parser.py)	2m 28s
	41m 12s

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