zpoolprops.7: document leaked

It's noted very scarcely in the code as it stands, indeed the only
actual comment on this is

  /*
   * We have finished background destroying, but there is still
   * some space left in the dp_free_dir. Transfer this leaked
   * space to the dp_leak_dir.
   */

Introduced in fbeddd60b79690b6a6ececc9b00b6014d21405aa ("Illumos 4390 -
I/O errors can corrupt space map when deleting fs/vol"),
which explains, alongside the references, that this can only happen
with a corrupted pool

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: George Melikov <[email protected]>
Signed-off-by: Ahelenia Ziemiańska <[email protected]>
Closes #13081 

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