fix typo

docs/USAGE.md

@@ -452,7 +452,7 @@ There are two different types of fee; bitcoin network transaction fees and fees
 
 #### Bitcoin network fees.
 
-This is controlled using the setting of `tx_fees` in the `[POLICY]` section in your `joinmarket.cfg` file in the current directory. If you set it to a number between 1 and 1000 it is treated as the targeted number of blocks for confirmation; e.g. if you set it to 20 you are asking to use whatever Bitcoin Core things is a realistic fee to get confirmation within the next 20 blocks. By default it is 3. If you set it to a number > 1000, don't set it lower than about 1200, it will be interpreted as "number of satoshis per kilobyte for the transaction fee". 1000 equates to 1 satoshi per byte (ignoring technical details of vbyte), which is usually the minimum fee that nodes on the network will relay. Note that Joinmarket will deliberately vary your choice randomly, in this case, by 20% either side, to avoid you watermarking all your transactions with the exact same fee rate. As an example, if you prefer to use an approximate rate of 20 sats/byte rather than rely on Bitcoin Core's estimated target for 3 or 6 blocks, then set `tx_fees` to 20000.
+This is controlled using the setting of `tx_fees` in the `[POLICY]` section in your `joinmarket.cfg` file in the current directory. If you set it to a number between 1 and 1000 it is treated as the targeted number of blocks for confirmation; e.g. if you set it to 20 you are asking to use whatever Bitcoin Core thinks is a realistic fee to get confirmation within the next 20 blocks. By default it is 3. If you set it to a number > 1000, don't set it lower than about 1200, it will be interpreted as "number of satoshis per kilobyte for the transaction fee". 1000 equates to 1 satoshi per byte (ignoring technical details of vbyte), which is usually the minimum fee that nodes on the network will relay. Note that Joinmarket will deliberately vary your choice randomly, in this case, by 20% either side, to avoid you watermarking all your transactions with the exact same fee rate. As an example, if you prefer to use an approximate rate of 20 sats/byte rather than rely on Bitcoin Core's estimated target for 3 or 6 blocks, then set `tx_fees` to 20000.
 Note that some liquidity providers (Makers) will offer very small contributions to the tx fee, but mostly you should consider that you must pay the whole Bitcoin network fee yourself, as an instigator of a coinjoin (a Taker). Note also that if you set 7 counterparties, you are effectively paying for approximately 7 normal sized transactions; be cognizant of that!
 
 #### CoinJoin fees.