rust

Small corrections to Javascript section (#278) #15

Job	Run time
build (component-model/examples/example-host)	1m 49s
build (component-model/examples/tutorial/command, component)	17s
build (component-model/examples/tutorial/adder, component)	13s
build (component-model/examples/tutorial/calculator, component)	12s
	2m 31s

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