syscall.h: fix doc text for syscall_get_arch()
syscall.h: fix doc text for syscall_get_arch()

syscall_get_arch() used to take a task as a argument.  It now uses
current.  Fix the doc text.

Signed-off-by: Richard Guy Briggs <eb4b5bbb4a6cbf3468229148f167a307303eeb1f@redhat.com>
Signed-off-by: Eric Paris <b0b36e3cd9ea4e5739ff430a3056fabf2fdb0376@redhat.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs