change documentation

src/com/owncloud/android/ui/activity/Preferences.java

@@ -369,7 +369,7 @@ public class Preferences extends PreferenceActivity
         mPrefInstantUploadCategory = (PreferenceCategory) findPreference("instant_uploading_category");
 
         if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
-            // Instant upload via preferences on pre pre M
+            // Instant upload via preferences on pre Android Marshmallow
             mPrefInstantUploadPath = findPreference("instant_upload_path");
             if (mPrefInstantUploadPath != null) {