Remove the nonce when using signAndSend (promise examples) (#648)

* Remove the nonce when using signAndSend

* Update descriptions

docs/examples/promise/06_make_transfer/index.js

@@ -16,16 +16,12 @@ async function main () {
   // Instantiate the API
   const api = await ApiPromise.create();
 
-  // Retrieve the nonce for Alice, to be used to sign the transaction
-  const aliceNonce = await api.query.system.accountNonce(alice.address());
-
-  // Create a extrinsic, transferring 12345 units to Bob. We can also create,
-  // sign and send in one operation (as per the samples in the Api documentation),
-  // here we split it out for the sake of readability
+  // Create a extrinsic, transferring 12345 units to Bob
   const transfer = api.tx.balances.transfer(BOB_ADDR, 12345);
 
-  // Sign and send the transaction using our account. Send the transaction and retrieve the resulting Hash
+  // Sign and send the transaction using our account
   transfer.signAndSend(alice, ({ status, type }) => {
+    // retrieve the hash once we are finalised
     if (type === 'Finalised') {
       console.log(`Successful transfer of 12345 from Alice to Bob with hash ${status.asFinalised.toHex()}`);
     } else {

docs/examples/promise/10_upgrade_chain/index.js

@@ -17,9 +17,6 @@ async function main () {
   // retrieve the upgrade key from the chain state
   const adminId = await api.query.sudo.key();
 
-  // get the nonce for the admin key
-  const adminNonce = await api.query.system.accountNonce(adminId);
-
   // find the actual keypair in the keyring (if this is an changed value, the key
   // needs to be added to the keyring before - this assumes we have defaults, i.e.
   // Alice as the key - and this already exists on the test keyring)
@@ -30,7 +27,7 @@ async function main () {
   const code = fs.readFileSync('./test.wasm').toString('hex');
   const proposal = api.tx.consensus.setCode(`0x${code}`);
 
-  console.log(`Upgrading from ${adminId} with nonce ${adminNonce}, ${code.length / 2} bytes`);
+  console.log(`Upgrading from ${adminId}, ${code.length / 2} bytes`);
 
   // preform the actual chain upgrade via the sudo module
   api.tx.sudo