staging: android: logger.h: Complete documentation of logger_entry

Previously, there were simply comments after each part - Now, it
is
completed properly according to "Kernel doc" Sorry in advance if I
made
any mistakes.

Signed-off-by: Cruz Julian Bishop
<cruzjbishop@gmail.com>
Signed-off-by: Greg Kroah-Hartman
<gregkh@linuxfoundation.org>
Signed-off-by: Pranav Vashi
<neobuddy89@gmail.com>

idea is taken here -
https://github.com/anarkia1976/AK-xGenesis/commit/232182964a3e6e2fe450ea69e93606ae51b16c0f