rust

refactor: revise and expand on 'Component Model Concepts' section (#286) #138

Job	Run time
build (component-model/examples/tutorial/command, component)	20s
build (component-model/examples/example-host)	1m 55s
build (component-model/examples/tutorial/calculator, component)	18s
build (component-model/examples/tutorial/adder, component)	28s
	3m 1s

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