message: Correct command in validator hard mode guide
  Explorer run command was wrong (it was using an old command), and has been fixed from explorer to serve.
diff: @@ -243,9 +243,9 @@ diem-node --config ~/.0L/validator.node.yaml >> ~/.0L/logs/validator.log 2>&1
  6.2 Restart the tower app after your validator is running, refer to [Step 5](#5-start-producing-delay-proofs-delay-mining) - ctrl+ C and restart it.
  -Once you have been on boarded you should see you public key in the list of validators. Run the explorer to view:
  +Once you have been on boarded you should see you public key in the list of validators. Run the web monitor to view:
  ```
  -ol explorer
  +ol serve -c
  ```
  ---
  