doc: update signet faucet link in offline-signing-tutorial.md

doc/offline-signing-tutorial.md

@@ -114,7 +114,7 @@ At this point, it's important to understand that both the `offline_wallet` and o
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 ```
 
-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`
 {
     ...
 }
-```
+```