Fix according to the review

docs/adguard-for-android/solving-problems/secure-folder.md

@@ -18,7 +18,7 @@ If you install AdGuard to [the *Secure folder* on your Android](https://www.sams
 1. Minimize the app and go to the *Secure folder*.
 1. Tap the three-dot menu and go to **Settings** → **Other security settings**.
 1. Tap **Security certificates** → **Install from device storage** → **CA certificate** → **Install anyway**
-1. Confirm installation with your graphic key/password/fingerprint →
+1. Confirm installation with your graphic key/password/fingerprint.
 1. Find and select the previously saved certificate, then tap **Done**.
 1. Return to the AdGuard app and navigate back to the main screen. You may have to swipe and restart the app to get rid of the *HTTPS filtering is off* message.
 1. Done! The certificate has been installed.