message: [commissioner] fix typo in help
diff: @@ -110,17 +110,17 @@ static void PrintUsage(const char *aProgram, FILE *aStream, int aExitCode)
  " %s [Options]\n"
  "Options:\n"
  " -H, --agent-host STRING Host of border agent\n"
  - " -P, --agent-port NUMBER UDP port used by border agent\n"
  + " -P, --agent-port NUMBER UDP port of border agent\n"
  " -N, --network-name STRING UTF-8 encoded network name\n"
  " -C, --network-password STRING Thread network password\n"
  " -X, --xpanid HEX Extended PAN ID in hex\n"
  " -A, --allow-all Allow all joiners\n"
  " -E, --joiner-eui64 HEX Joiner EUI64 value\n"
  - " -J, --joiner-pskd STRING Base32 thread encoded PSK for the joiner\n"
  - " -L, --steering-data-length NUMBER Length of steering data 1..16\n"
  + " -D, --joiner-pskd STRING Joiner's base32-thread encoded PSK\n"
  + " -L, --steering-data-length NUMBER Steering data length(1~16)\n"
  " -l, --log-file PATH Log to file\n"
  - " -i, --keep-alive-interval NUMBER Set COMM_KA requests interval\n"
  - " -d, --debug-level NUMBER Enable debug output at level VALUE (0~7)\n"
  + " -i, --keep-alive-interval NUMBER COMM_KA requests interval\n"
  + " -d, --debug-level NUMBER Debug level(0~7)\n"
  " -q, --disable-syslog Disable log via syslog\n"
  " -h, --help Print this help\n",
  aProgram);
  