ntfs-3g: use opt prefix, update instructions.

* Use opt prefix so that symlink won't be broken when upgrading.
  - Currently #{sbin} will be broken when older versions gets cleaned.
* Update URL for instructions, which gets moved to wordpress.
* Remove '-o noappledouble' option as it may cause some problem as
  mentioned in the original blog.

Closes #19353.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>