[gvfs] Remove some obsoleted txt files

[Ondrej Holy <oholy src gnome org>]

commit 054b2b691855428c32d6e40ff090c1a741dfafff
Author: Ondrej Holy <oholy redhat com>
Date:   Fri Nov 20 09:02:45 2015 +0100

    Remove some obsoleted txt files
    
    Those obsolete files are covered by up to date online docs:
    https://wiki.gnome.org/Projects/gvfs/doc

 TODO              |   32 ------------
 dbus.txt          |   83 -------------------------------
 txt/gvfs_dbus.txt |   65 ------------------------
 txt/ops.txt       |  140 -----------------------------------------------------
 4 files changed, 0 insertions(+), 320 deletions(-)