fix: correct typos and remove duplicate code across client and baseapp packages (#24991)

Co-authored-by: Alex | Interchain Labs <alex@interchainlabs.io>

client/tx/tx.go

@@ -242,10 +242,10 @@ func checkMultipleSigners(tx authsigning.Tx) error {
 	return nil
 }
 
-// Sign signs a given tx with a named key. The bytes signed over are canconical.
+// Sign signs a given tx with a named key. The bytes signed over are canonical.
 // The resulting signature will be added to the transaction builder overwriting the previous
 // ones if overwrite=true (otherwise, the signature will be appended).
-// Signing a transaction with mutltiple signers in the DIRECT mode is not supported and will
+// Signing a transaction with multiple signers in the DIRECT mode is not supported and will
 // return an error.
 // An error is returned upon failure.
 func Sign(ctx context.Context, txf Factory, name string, txBuilder client.TxBuilder, overwriteSig bool) error {

client/tx/tx_test.go

@@ -315,7 +315,7 @@ func TestSign(t *testing.T) {
 		/**** test double sign Direct mode
 		  signing transaction with 2 or more DIRECT signers should fail in DIRECT mode ****/
 		{
-			"direct: should  append a DIRECT signature with existing AMINO",
+			"direct: should append a DIRECT signature with existing AMINO",
 			// txb already has 1 AMINO signature
 			txfDirect, txb, from1, false,
 			[]cryptotypes.PubKey{pubKey2, pubKey1},