doc comment link leads to 404; doc for branch_wire missing

[qartik]

hugr/hugr-core/src/builder/cfg.rs

Lines 401 to 405 in 649589c

	/// [Set outputs](BlockBuilder::set_outputs) and [finish](`BlockBuilder::finish_sub_container`).
	pub fn finish_with_outputs(
	mut self,
	branch_wire: Wire,
	outputs: impl IntoIterator<Item = Wire>,

'Set outputs' leads to https://docs.rs/hugr-core/0.13.3/hugr_core/builder/cfg/struct.DFGWrapper.html

Also, consider adding some doc for branch_wire. It's not obvious how the data from branch wire is different from that in outputs.