separated_list doc and test update #1081

Job	Run time
Check formatting	4s
Build documentation	1m 6s
Bench	3m 20s
Test minimal rust version	3m 20s
Test (stable)	1m 6s
Test (beta)	3m 11s
Test (nightly)	3m 5s
Test (1.65.0)	4m 3s
Test (stable, --features "std")	50s
Test (stable, --no-default-features)	3m 0s
Test (stable, --no-default-features --features "alloc")	1m 12s
Test (nightly, --no-default-features)	46s
Test (nightly, --no-default-features --features "alloc")	47s
Coverage	5m 19s
	31m 9s

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