selftests: net: Fix typo 'the the' in comment

Replace 'the the' with 'the' in the comment.
Signed-off-by: Slark Xiao <slark_xiao@163.com>
Link: https://lore.kernel.org/r/20220725020124.5760-1-slark_xiao@163.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/forwarding/vxlan_asymmetric.sh

@@ -525,7 +525,7 @@ arp_suppression()
 
 	log_test "neigh_suppress: on / neigh exists: yes"
 
-	# Delete the neighbour from the the SVI. A single ARP request should be
+	# Delete the neighbour from the SVI. A single ARP request should be
 	# received by the remote VTEP
 	RET=0