rust

Add line breaks before/after code blocks (#291) #127

Job	Run time
build (component-model/examples/tutorial/command, component)	25s
build (component-model/examples/example-host)	1m 56s
build (component-model/examples/tutorial/adder, component)	15s
build (component-model/examples/tutorial/calculator, component)	20s
	2m 56s

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