selftests: net: Fix minor typos in MPTCP and psock tests

Fixes minor spelling errors:
- `simult_flows.sh`: "al testcases" -> "all testcases"
- `psock_tpacket.c`: "accross" -> "across"

Signed-off-by: Suchit Karunakaran <[e-mail]>
Reviewed-by: Matthieu Baerts (NGI0) <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

tools/testing/selftests/net/mptcp/simult_flows.sh

···
 
 usage() {
 	echo "Usage: $0 [ -b ] [ -c ] [ -d ] [ -i]"
-	echo -e "\t-b: bail out after first error, otherwise runs al testcases"
+	echo -e "\t-b: bail out after first error, otherwise runs all testcases"
 	echo -e "\t-c: capture packets for each test using tcpdump (default: no capture)"
 	echo -e "\t-d: debug this script"
 	echo -e "\t-i: use 'ip mptcp' instead of 'pm_nl_ctl'"

tools/testing/selftests/net/psock_tpacket.c

···
  *
  * Datapath:
  *   Open a pair of packet sockets and send resp. receive an a priori known
- *   packet pattern accross the sockets and check if it was received resp.
+ *   packet pattern across the sockets and check if it was received resp.
  *   sent correctly. Fanout in combination with RX_RING is currently not
  *   tested here.
  *