docs: add aliases to `get_transaction_count` #1475

Job	Run time
clippy	1m 40s
feature-checks	6m 31s
docs	2m 3s
doctest	3m 8s
fmt	13s
no-std	40s
test stable --no-default-features	2m 36s
wasm-unknown	1m 51s
wasm-wasi	2m 51s
test stable	2m 39s
test stable --all-features	3m 3s
test nightly --no-default-features	2m 38s
test nightly	2m 41s
test nightly --all-features	3m 3s
test 1.76 --no-default-features	1m 56s
test 1.76	1m 59s
	39m 32s

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