rust

Fix broken links reported as warnings by mdbook #323

Job	Run time
build (component-model/examples/tutorial/adder, component)	33s
build (component-model/examples/tutorial/command, component)	21s
build (component-model/examples/tutorial/calculator, component)	19s
build (component-model/examples/example-host)	1m 45s
	2m 58s

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