Merge bitcoin/bitcoin#31925: contrib: update utxo_to_sqlite tool documentation and comment

e747ed9 contrib: fix read metadata related comment (rkrux)
d3095ac contrib: update `dumptxoutset` command in utxo_to_sqlite doc (rkrux)

Pull request description:

  I noticed couple discrepancies in the documentation and comments of `utxo_to_sqlite` tool while using it, this PR fixes them. More details in the commit messages.

ACKs for top commit:
  theStack:
    lgtm ACK e747ed9

Tree-SHA512: c5dab25d97c50a203ba008acfc5c93baf20cf24261a5a5127bdacc41eeeeae1c9d7b129710c2997e9fd1536ec000186e7f6395efc0188e1111b47868b7d9745a

Author: fanquake

contrib/utxo-tools/utxo_to_sqlite.py

@@ -5,7 +5,7 @@
 """Tool to convert a compact-serialized UTXO set to a SQLite3 database.
 
 The input UTXO set can be generated by Bitcoin Core with the `dumptxoutset` RPC:
-$ bitcoin-cli dumptxoutset ~/utxos.dat
+$ bitcoin-cli dumptxoutset ~/utxos.dat latest
 
 The created database contains a table `utxos` with the following schema:
 (txid TEXT, vout INT, value INT, coinbase INT, height INT, scriptpubkey TEXT)
@@ -126,7 +126,7 @@ def main():
     con = sqlite3.connect(args.outfile)
     con.execute("CREATE TABLE utxos(txid TEXT, vout INT, value INT, coinbase INT, height INT, scriptpubkey TEXT)")
 
-    # read metadata (magic bytes, version, network magic, block height, block hash, UTXO count)
+    # read metadata (magic bytes, version, network magic, block hash, UTXO count)
     f = open(args.infile, 'rb')
     magic_bytes = f.read(5)
     version = int.from_bytes(f.read(2), 'little')