apparmor: Fix doc comment for compute_fperms

When compute_fperms was moved to policy_compat and made static it
was renamed from aa_compute_fperms to just compute_fperms to help
indicate it is only available statically. Unfortunately the doc
comment did not also get updated to reflect the change.
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>

security/apparmor/policy_compat.c

@@ -140,8 +140,8 @@ static struct aa_perms compute_fperms_other(struct aa_dfa *dfa,
 }
 
 /**
- * aa_compute_fperms - convert dfa compressed perms to internal perms and store
- *		       them so they can be retrieved later.
+ * compute_fperms - convert dfa compressed perms to internal perms and store
+ *		    them so they can be retrieved later.
  * @dfa: a dfa using fperms to remap to internal permissions
  *
  * Returns: remapped perm table