update docs and version

app/build.gradle

@@ -7,8 +7,8 @@ android {
         applicationId "com.m2049r.xmrwallet"
         minSdkVersion 21
         targetSdkVersion 25
-        versionCode 7
+        versionCode 8
-        versionName "0.5"
+        versionName "0.5.1"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         externalNativeBuild {
             cmake {

doc/FAQ.md

@@ -14,7 +14,9 @@
 - Background updating (make sure you exit the wallet to stop updating to save some battery)
 - Access to daemon with username/password and nonstandard port
 - Only 5 decimal places shown in transactions (full amount in details - click on transaction)
-- All significant figures shown balance
+- All significant figures shown in balance
+- QR Code scanning incl. payment ID - make sure to *ALWAYS* verify
+the scanned code is what it is advertised to be!
 
 ## I cannot select and copy the mnemonic seed
 Copying anything to the clipboard on Android exposes it to any other App running. So this