Fix Documentation in FSDP and DeepSpeed Concept Guide #4484

Job	Run time
run-tests (latest, test_prod)	2m 7s
run-tests (latest, test_core)	11m 30s
run-tests (latest, test_cli)	3m 44s
run-tests (latest, test_big_modeling)	2m 36s
run-tests (latest, test_deepspeed)	5m 50s
run-tests (latest, test_fsdp)	2m 35s
run-tests (latest, test_example_differences)	2m 33s
run-tests (latest, test_checkpoint_step)	3m 59s
run-tests (latest, test_checkpoint_epoch)	3m 55s
run-tests (latest, test_rest)	7m 59s
run-tests (minimum, test_prod)	1m 53s
run-tests (minimum, test_core)	3m 15s
run-tests (minimum, test_cli)	3m 46s
run-tests (minimum, test_big_modeling)	2m 34s
run-tests (minimum, test_deepspeed)	2m 52s
run-tests (minimum, test_fsdp)	2m 46s
run-tests (minimum, test_example_differences)	2m 42s
run-tests (minimum, test_checkpoint_step)	4m 11s
run-tests (minimum, test_checkpoint_epoch)	12m 19s
run-tests (minimum, test_rest)	8m 9s
	1h 31m 15s

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