Add comments to document reregister testcase

Author: nvsriram

solana/programs/example-native-token-transfers/tests/admin.rs

@@ -118,23 +118,11 @@ async fn test_reregister_all_transceivers() {
         .submit_with_signers(&[&test_data.program_owner], &mut ctx)
         .await
         .unwrap();
+        // assert threshold decreases
         assert_threshold(&mut ctx, num_dummy_transceivers - idx as u8).await;
     }
 
-    // deregister baked-in transceiver
-    deregister_transceiver(
-        &good_ntt,
-        DeregisterTransceiver {
-            owner: test_data.program_owner.pubkey(),
-            transceiver: example_native_token_transfers::ID,
-        },
-    )
-    .submit_with_signers(&[&test_data.program_owner], &mut ctx)
-    .await
-    .unwrap();
-    assert_threshold(&mut ctx, 1).await;
-
-    // reregister dummy transceiver
+    // reregister dummy transceivers
     for (idx, transceiver) in dummy_transceivers.iter().enumerate() {
         register_transceiver(
             &good_ntt,
@@ -147,6 +135,7 @@ async fn test_reregister_all_transceivers() {
         .submit_with_signers(&[&test_data.program_owner], &mut ctx)
         .await
         .unwrap();
+        // assert transceiver_id and threshold are retained
         assert_transceiver_id(&mut ctx, transceiver, idx as u8 + 1).await;
         assert_threshold(&mut ctx, 1).await;
     }
@@ -163,6 +152,7 @@ async fn test_reregister_all_transceivers() {
     .submit_with_signers(&[&test_data.program_owner], &mut ctx)
     .await
     .unwrap();
+    // assert transceiver_id and threshold are retained
     assert_transceiver_id(&mut ctx, &example_native_token_transfers::ID, 0).await;
     assert_threshold(&mut ctx, 1).await;
 }