doc: update after changes in recoverloopin

doc/chantools_recoverloopin.md

@@ -13,7 +13,7 @@ chantools recoverloopin \
 	--txid abcdef01234... \
 	--vout 0 \
 	--swap_hash abcdef01234... \
-	--loop_db_path /path/to/loop.db \
+	--loop_db_dir /path/to/loop/db/dir \
 	--sweep_addr bc1pxxxxxxx \
 	--feerate 10
 ```
@@ -25,7 +25,7 @@ chantools recoverloopin \
       --bip39                 read a classic BIP39 seed and passphrase from the terminal instead of asking for lnd seed format or providing the --rootkey flag
       --feerate uint32        fee rate to use for the sweep transaction in sat/vByte
   -h, --help                  help for recoverloopin
-      --loop_db_path string   path to the loop database file
+      --loop_db_dir string    path to the loop database directory, where the loop.db file is located
       --num_tries int         number of tries to try to find the correct key index (default 1000)
       --publish               publish sweep TX to the chain API instead of just printing the TX
       --rootkey string        BIP32 HD root key of the wallet to use for deriving starting key; leave empty to prompt for lnd 24 word aezeed