Add comments to `publish/upgrade` methods in `(Programmable)TransactionBuilder` #12674

Job	Run time
diff	9s
external-crates-test (ubuntu-ghcloud)	2m 10s
clippy	51s
cargo-deny (advisories, licenses, bans, ...)	5m 56s
rustfmt	20s
external-crates-test	0s
move-prover	0s
	9m 26s

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