kernfs: remove a false note

Things are a little tricky:

1. If the host is "modern" (any desktop distro after 2013), the kernel
   supports devtmpfs and the host udev will do adjustments to the
   devtmpfs.  All instances of devtmpfs shares the same content so we'll
   see the work of both the kernel and the host udev in chroot.
2. If the host is old but the kernel supports devtmpfs (i. e. the host
   is not using devtmpfs for its /dev), when we mount devtmpfs on
   $LFS/dev we'll see the work of the kernel in chroot, but not the work
   of udev.  **Building LFS does not need any work of udev.**
3. If the host is very old and the kernel does not support devtmpfs at
   all, we can't mount devtmpfs.

Mounting a devtmpfs will work for 1 and 2, while bind mounting will work
for 1, 2, and 3.  So we use bind mounting here.

I don't want to squash all these details into the book, so just remove
the false statement here.

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