netfilter: nft_set_pipapo: Fix mapping table example in comments

In both insertion and lookup examples, the two element pointers
of rule mapping tables were swapped. Fix that.
Reported-by: NPablo Neira Ayuso <pablo@netfilter.org>
Fixes: 3c4287f6 ("nf_tables: Add set type for arbitrary concatenation of ranges")
Signed-off-by: NStefano Brivio <sbrivio@redhat.com>
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nft_set_pipapo.c

@@ -203,7 +203,7 @@
  * ::
  *
  *       rule indices in last field:    0    1
- *       map to elements:             0x42  0x66
+ *       map to elements:             0x66  0x42
  *
  *
  * Matching
@@ -298,7 +298,7 @@
  * ::
  *
  *       rule indices in last field:    0    1
- *       map to elements:             0x42  0x66
+ *       map to elements:             0x66  0x42
  *
  *      the matching element is at 0x42.
  *