Add linkage docs to scarb doc #8007

Job	Run time
scarb-metadata compatibility check	37s
check-website	9s
build test linux x86-64	4m 14s
doc tests	3m 3s
build test windows x86-64	9m 7s
check-rust	3m 45s
test linux x86-64 1/8	21m 12s
test linux x86-64 2/8	23m 49s
test linux x86-64 3/8	19m 42s
test linux x86-64 4/8	17m 6s
test linux x86-64 5/8	15m 41s
test linux x86-64 6/8	13m 3s
test linux x86-64 7/8	13m 22s
test linux x86-64 8/8	14m 31s
test windows x86-64 1/8	19m 1s
test windows x86-64 2/8	21m 12s
test windows x86-64 3/8	19m 1s
test windows x86-64 4/8	15m 20s
test windows x86-64 5/8	16m 0s
test windows x86-64 6/8	11m 34s
test windows x86-64 7/8	12m 39s
test windows x86-64 8/8	13m 16s
	4h 47m 24s

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