tor-cert: add a few hs TODOs

crates/tor-cert/src/lib.rs

@@ -129,6 +129,7 @@ caret_int! {
 
         // 08 through 09 and 0B are used for onion services.  They
         // probably shouldn't be, but that's what Tor does.
+        // TODO hs: Add these types.
     }
 }
 
@@ -173,6 +174,8 @@ pub enum CertifiedKey {
     X509Sha256Digest([u8; 32]),
     /// Some unrecognized key type.
     Unrecognized(UnrecognizedKey),
+    // TODO hs: Add new alternatives here for the case that we're handling key types from
+    // onion services.  These will correspond to types in tor-hscrypto.
 }
 
 /// A key whose type we didn't recognize.