doc: Fix JavaScript example on Group Transaction Signatures
@@ -204,7 +204,7 @@ With a group ID assigned, each transaction sender must authorize their respectiv
``` javascript tab="JavaScript"
// Sign each transaction in the group
signedTx1 = transaction1.signTxn( myAccountA.sk )
-signedTx2 = transaction1.signTxn( myAccountB.sk )
+signedTx2 = transaction2.signTxn( myAccountB.sk )
```
