doc: tor.md: use -bind=127.0.0.1:8334=onion for the Tor bind

After bitcoin#22729 if
`-bind=127.0.0.1` is used, then bitcoind will not automatically
also bind on `127.0.0.1:8334`.

Author: davidgumberg

doc/tor.md

@@ -193,7 +193,7 @@ In a typical situation, where you're only reachable via Tor, this should suffice
 listen on all devices and another node could establish a clearnet connection, when knowing
 your address. To mitigate this, additionally bind the address of your Tor proxy:
 
-    ./bitcoind ... -bind=127.0.0.1
+    ./bitcoind ... -bind=127.0.0.1:8334=onion
 
 If you don't care too much about hiding your node, and want to be reachable on IPv4
 as well, use `discover` instead: