Rust

Add safety notes about docs fields in soroban-spec-rust #5709

Job	Run time
fmt	15s
semver-checks	4m 9s
check-git-rev-deps	15s
build-fuzz	1m 20s
setup	3s
cargo-deny (advisories)	43s
cargo-deny (bans licenses sources)	39s
expand-test-wasms	48s
docs	39s
readme	1m 4s
migration-docs	17s
publish-dry-run	-1s
build (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	45s
build (latest, ubuntu-latest, x86_64-unknown-linux-gnu)	33s
test	0s
complete	4s
	11m 33s

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