docs: updata BoAT_User_Guide_en.md
modify Suggestion 6 and 8
@@ -550,7 +550,7 @@ index = BoatWalletCreate( BOAT_PROTOCOL_ETHEREUM, "boateth.keystore", &wallet_co
````
#### Unload Wallet
-Unloading the wallet will unload the loaded wallet from the memory. It will not delete the persistent wallet, but the persistent wallet cannot be used until it is loaded again.
+Unloading the wallet will unload the wallet from the memory. It will not delete the persistent wallet, but the persistent wallet cannot be used until it is loaded again.
````
void BoatWalletUnload(BSINT32 wallet_index);
