doc: Trivial fix for reuseaddr-priority

This test program checks for particular behaviour regardless of order of
operations.  So, we step through the test with all possible orders for
a number of different of parts.  Or at least, we're supposed to, a copy
pasta error led to using the same order for two things which should be
independent.

Fixes: 299c407501 ("doc: Add program to document and test assumptions about SO_REUSEADDR")
Reported-by: David Taylor <davidt@yadt.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

doc/platform-requirements/reuseaddr-priority.c

@@ -222,7 +222,7 @@ static void check_all_orders(void)
 			for (k = 0; k < norders; k++)
 				for (l = 0; l < norders; l++)
 					check_one_order(orders[i], orders[j],
-							orders[j], orders[l]);
+							orders[k], orders[l]);
 }
 
 int main(int argc, char *argv[])