[NFC] Correct comments and line spacing

- Correct spelling mistakes or working in comments.
- Adding missing line separators.
- Add missing comments for namespace closing brace.

Change-Id: If09cdd38aa088b0f68f750dfdef81351eb8c4935

rocclr/device/device.cpp

@@ -1,4 +1,4 @@
-/* Copyright (c) 2008-presenet Advanced Micro Devices, Inc.
+/* Copyright (c) 2008-present Advanced Micro Devices, Inc.
 
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal