Fix strings reported by yahoe.001

OpenKeychain/src/main/res/raw/help_changelog.html

@@ -141,7 +141,7 @@ Daniel Hammann, Daniel Haß, Greg Witczak, Miroojin Bakshi, Nikhil Peter Raj, Pa
 <h2>2.0</h2>
 <ul>
 <li>Complete redesign</li>
-<li>Share public keys via qr codes, nfc beam</li>
+<li>Share public keys via QR codes, NFC beam</li>
 <li>Sign keys</li>
 <li>Upload keys to server</li>
 <li>Fixes import issues</li>