Merge bitcoin/bitcoin#29544: doc: update signet faucet link in offline-signing-tutorial.md

990b348 doc: update signet faucet link in offline-signing-tutorial.md (Supachai Kheawjuy)

Pull request description:

  https://signet.bc-2.jp is broken and https://signetfaucet.com is the same as before.

  https://signet.bc-2.jp from archive.org
  <img width="1258" alt="image" src="https://github.com/bitcoin/bitcoin/assets/73651621/36817aa6-95ea-427d-8d1d-93e21af86dce">

  https://signetfaucet.com
  <img width="1242" alt="image" src="https://github.com/bitcoin/bitcoin/assets/73651621/e3248fb0-8a6d-45b3-9268-d883d2385c8f">

  reference: https://en.bitcoin.it/wiki/Signet#Faucets

ACKs for top commit:
  fanquake:
    ACK 990b348

Tree-SHA512: 482c931168a162cc666ecbe610e80d94ae433ebdc6bc52832bcc40c58592f9d9b8c7f1aea6faa2739873e80c6d4ea70c8a4f78d18067d1739e8070effce83062

Author: fanquake

doc/offline-signing-tutorial.md

@@ -114,7 +114,7 @@ At this point, it's important to understand that both the `offline_wallet` and o
 tb1qtu5qgc6ddhmqm5yqjvhg83qgk2t4ewajg0h6yh
 ```
 
-2. Visit a faucet like https://signet.bc-2.jp and enter your address from the previous command to receive a small amount of signet coins to this address.
+2. Visit a faucet like https://signetfaucet.com and enter your address from the previous command to receive a small amount of signet coins to this address.
 
 3. Confirm that coins were received using the online `watch_only_wallet`. Note that the transaction may take a few moments before being received on your local node, depending on its connectivity. Just re-run the command periodically until the transaction is received.
 
@@ -252,4 +252,4 @@ You can also show transactions related to the wallet using `listtransactions`
 {
     ...
 }
-```
+```