Fixed typo in aria_s3_copy

Author: montywi

storage/maria/aria_s3_copy.cc

@@ -113,7 +113,7 @@ static void usage(void)
  puts("\nThis software comes with NO WARRANTY: "
  " see the PUBLIC for details.\n");
  puts("Copy an Aria table to and from s3");
- printf("Usage: %s --aws-access-key=# --aws-secret-access-key=# --aws-region # "
+ printf("Usage: %s --aws-access-key=# --aws-secret-access-key=# --aws-region=# "
  "--op=(from_s3 | to_s3 | delete_from_s3) [OPTIONS] tables[.MAI]\n",
  my_progname_short);
  print_defaults("my", load_default_groups);