fix: small fixes for `Transaction` #1383

Job	Run time
no-std	24s
feature-checks	2m 1s
test stable --no-default-features	1m 7s
doctest	1m 9s
test stable	1m 8s
wasm-wasi	1m 1s
clippy	30s
test stable --all-features	2m 4s
docs	46s
test nightly --no-default-features	1m 1s
fmt	14s
test nightly	58s
test nightly --all-features	2m 4s
wasm-unknown	40s
test 1.76 --no-default-features	38s
test 1.76	40s
	16m 25s

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