test(sol-macro): add a test for missing_docs #2250

Job	Run time
wasm	25s
miri --no-default-features	5m 10s
miri	4m 50s
check no_std	32s
clippy	48s
miri --all-features	7m 43s
docs	29s
features stable	1m 25s
fmt	10s
features stable --all-targets	2m 41s
test ubuntu-latest stable --no-default-features	55s
features nightly	1m 33s
test ubuntu-latest stable	1m 7s
features nightly --all-targets	3m 6s
test ubuntu-latest nightly --no-default-features	47s
test ubuntu-latest nightly	51s
test ubuntu-latest 1.81 --no-default-features	31s
test ubuntu-latest 1.81	30s
test windows-latest stable --no-default-features	2m 34s
test windows-latest stable	2m 53s
test windows-latest nightly --no-default-features	2m 8s
test windows-latest nightly	2m 13s
test windows-latest 1.81 --no-default-features	1m 12s
test windows-latest 1.81	1m 43s
test ubuntu-latest 1.81 --features json	33s
test windows-latest 1.81 --features json	1m 16s
test ubuntu-latest nightly --all-features	1m 4s
test windows-latest nightly --all-features	2m 50s
deny / cargo deny check	18s
ci success	1s
	52m 18s

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