ssh: Test and enhance handling of nonexistent subsystem
ssh: Ctify test doc
ssh: Prepare for upcoming release

Note: If more things are added before the next releas the
appup will need more updates.
Merge branch 'ia/ssh/errorhandling-nonexisting-subsystem/OTP-10714' into maint

* ia/ssh/errorhandling-nonexisting-subsystem/OTP-10714:
  ssh: Prepare for upcoming release
  ssh: Ctify test doc
  ssh: Test and enhance handling of nonexistent subsystem
ssl: correct test case
Merge branch 'ia/ssl/tcp_connect_test' into maint

* ia/ssl/tcp_connect_test:
  ssl: correct test case