kunit: Fix spelling mistakes in comments and messages

Fix two spelling mistakes in kunit tooling:
  Bascially -> Basically
  higer     -> higher

Link: https://lore.kernel.org/r/20260501162739.3861-1-always.starving0@gmail.com
Signed-off-by: Jinseok Kim <always.starving0@gmail.com>
Reviewed-by: David Gow <david@davidgow.net>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>