docs: fix spelling `clonable` -> `cloneable` #462

Job	Run time
Docs	29s
Run clippy for every feature combination	3m 29s
Run clippy	31s
Publish dry run	1m 11s
Rustfmt	6s
Run test suite	1m 3s
Run test suite with every feature combination	20m 28s
Spell Check with Typos	3s
	27m 20s

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