Merge pull request #418 from daira/action-doc-nit

Trivial update to the doc for `struct Action`

src/action.rs

@@ -8,12 +8,8 @@ use crate::{
 
 /// An action applied to the global ledger.
 ///
-/// Externally, this both creates a note (adding a commitment to the global ledger),
-/// and consumes some note created prior to this action (adding a nullifier to the
-/// global ledger).
-///
-/// Internally, this may both consume a note and create a note, or it may do only one of
-/// the two. TODO: Determine which is more efficient (circuit size vs bundle size).
+/// This both creates a note (adding a commitment to the global ledger), and consumes
+/// some note created prior to this action (adding a nullifier to the global ledger).
 #[derive(Debug, Clone)]
 pub struct Action<A> {
     /// The nullifier of the note being spent.