[docs] add an example of sending a token (#20779)

## Description 
fix #20725  

add an example of sending a coin other than sui coin


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## Release notes

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- [ ] Protocol: 
- [ ] Nodes (Validators and Full nodes): 
- [ ] gRPC:
- [ ] JSON-RPC: 
- [ ] GraphQL: 
- [ ] CLI: 
- [ ] Rust SDK:

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Co-authored-by: ronny-mysten <[email protected]>

docs/content/guides/developer/sui-101/building-ptb.mdx

@@ -111,6 +111,14 @@ With PTBs, you can use the gas payment coin to construct coins with a set balanc
 
 You can also transfer the gas coin using `transferObjects`, in the event that you want to transfer all of your coin balance to another address.
 
+Of course, you can also transfer other coins in your wallet using their `Object ID`. For example,
+
+```ts
+const otherCoin = tx.object('0xCoinObjectId');
+const coin = tx.splitCoins(otherCoin, [tx.pure(100)]);
+tx.transferObjects([coin], tx.pure(address));
+```
+
 ## Get PTB bytes
 
 If you need the PTB bytes, instead of signing or executing the PTB, you can use the `build` method on the transaction builder itself.