Documentation: remove obsolete files from 00-INDEX

Time interpolators were removed in git 1f564ad6 ("[IA64] remove
time interpolator"), and Voyager support went away in git b6b6e2b1
("Documentation: remove obsolete voyager.txt file")

Signed-off-by: Rob Landley <rlandley@parallels.com>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>