samples/bpf: Fix typo in xdp_router_ipv4 sample

Fix typo in xdp_router_ipv4 sample.

Signed-off-by: Deming Wang <[e-mail]>
Signed-off-by: Andrii Nakryiko <[e-mail]>
Link: https://lore.kernel.org/bpf/[e-mail]

samples/bpf/xdp_router_ipv4_user.c

···
 					/* Rereading the route table to check if
 					 * there is an entry with the same
 					 * prefix but a different metric as the
-					 * deleted enty.
+					 * deleted entry.
 					 */
 					get_route_table(AF_INET);
 				} else if (prefix_key->data[0] ==