improve text (#468)

Author: rtomas

snippets/appkit/shared/options.mdx

@@ -39,6 +39,8 @@ createAppKit({
 });
 ```
 
+This information will primarily be used in modals when signing a transaction or message using [Embedded wallets (Smart Accounts)](/appkit/features/smart-accounts), or when verifying ownership with [SIWE/SIWX](/appkit/authentication/siwx/default) using any wallet.
+
 For custom networks, refer to this [doc page](/appkit/react/core/custom-networks).
 
 ## defaultNetwork