Add more info to Silent Payments

Author: tuxpizza

Diff for: docs/cryptos/bitcoin.md

@@ -70,7 +70,7 @@ In order to enable Silent Payments, tap the switch on the "Silent Payments" card
 
 [![Toggle Silent Payments scanning](./silentpayments.png){:width="32%"}](./silentpayments.png)
 
-The wallet will start scanning from the height of when you first opened it after installing 4.18.0 or higher, or continue where it left off. Silent Payments scanning will automnatically turn off once it has reached the current blockheight. If you would like it to automatically scan for Silent Payment transactions for new blocks, please toggle an option under Menu -> Silent Payments settings -> "Set Silent Payments always scanning" to on.
+The wallet will start scanning from the height of when you first opened it after installing 4.18.0 or higher, or continue where it left off. Silent Payments scanning will automnatically turn off once it has reached the current blockheight. If you would like it to automatically scan for Silent Payment transactions on new blocks, please toggle an option under Menu -> Silent Payments settings -> "Set Silent Payments always scanning" to on. Silent Payments scanning will automatically toggle on if there are new blocks to scan and toggle back off when it's finished.
 
 [![App menu](./menu.png){:width="32%"}](./menu.png)
 [![Toggle always scanning](./alwaysscan.png){:width="32%"}](./alwaysscan.png)