Revert "scripts/gdb: add documentation example for radix tree"

This reverts commit 9b558035 ("scripts/gdb: add documentation
example for radix tree")

The python implementation of radix tree was merged at the same time as a
refactoring of the radix tree implementation and doesn't work.  The
feature is being reverted, thus we revert the documentation as well.

Link: http://lkml.kernel.org/r/1467127337-11135-7-git-send-email-kieran@bingham.xyz


Signed-off-by: Kieran Bingham <kieran@bingham.xyz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>