XFRM docs are currently reside in Documentation/networking directory,
yet these are distinctive as a group of their own. Move them into xfrm
subdirectory.
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>