test(sol-macro): add a test for missing_docs #2252

Job	Run time
check no_std	31s
miri --no-default-features	4m 55s
features stable	1m 39s
test ubuntu-latest stable --no-default-features	52s
miri	4m 48s
features stable --all-targets	2m 38s
test ubuntu-latest stable	57s
wasm	24s
miri --all-features	7m 38s
features nightly	1m 32s
test ubuntu-latest nightly --no-default-features	46s
features nightly --all-targets	2m 49s
test ubuntu-latest nightly	45s
clippy	44s
test ubuntu-latest 1.81 --no-default-features	27s
docs	29s
test ubuntu-latest 1.81	28s
fmt	11s
test windows-latest stable --no-default-features	2m 18s
test windows-latest stable	2m 23s
test windows-latest nightly --no-default-features	1m 58s
test windows-latest nightly	2m 15s
test windows-latest 1.81 --no-default-features	1m 20s
test windows-latest 1.81	1m 14s
test ubuntu-latest 1.81 --features json	29s
test windows-latest 1.81 --features json	1m 21s
test ubuntu-latest nightly --all-features	1m 5s
test windows-latest nightly --all-features	2m 35s
deny / cargo deny check	19s
ci success	7s
	49m 57s

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