apparmor: add missing params to aa_may_ptrace kernel-doc comments

When the cred was explicit passed through to aa_may_ptrace() the
kernel-doc comment was not properly updated.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202311040508.AUhi04RY-lkp@intel.com/


Signed-off-by: John Johansen <john.johansen@canonical.com>