add name to substantially changed files in license header

Signed-off-by: parneet-guraya <gurayaparneet@gmail.com>

app/src/main/java/com/owncloud/android/ui/activity/FileDisplayActivity.java

@@ -7,11 +7,14 @@
  * @author Chris Narkiewicz
  * @author TSI-mc
  * @author Archontis E. Kostis
+ * @author Parneet Singh
+ *
  * Copyright (C) 2011  Bartek Przybylski
  * Copyright (C) 2016 ownCloud Inc.
  * Copyright (C) 2018 Andy Scherzinger
  * Copyright (C) 2019 Chris Narkiewicz <hello@ezaquarii.com>
  * Copyright (C) 2023 TSI-mc
+ * Copyright (C) 2023 Parneet Singh
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2,

app/src/main/java/com/owncloud/android/ui/preview/PreviewMediaFragment.java

@@ -5,10 +5,13 @@
  *   @author Chris Narkiewicz
  *   @author Andy Scherzinger
  *   @author TSI-mc
+ *   @author Parneet Singh
+ *
  *   Copyright (C) 2016 ownCloud Inc.
  *   Copyright (C) 2019 Chris Narkiewicz <hello@ezaquarii.com>
  *   Copyright (C) 2020 Andy Scherzinger
  *   Copyright (C) 2023 TSI-mc
+ *   Copyright (C) 2023 Parneet Singh
  *
  *   This program is free software: you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License version 2,

app/src/main/res/layout/fragment_preview_media.xml

@@ -3,6 +3,7 @@
 
   Copyright (C) 2020 Andy Scherzinger
   Copyright (C) 2015 ownCloud Inc.
+  Copyright (C) 2023 Parneet Singh
 
   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License version 2,