message: docs: fix example for `get_stacks_wallet_key`
  This example previously used `get_stacks_payment_key`.
diff: @@ -389,7 +389,7 @@ Get the payment private key from a 24-word backup phrase used by the Stacks wall
  Example
  // Specify -t for testnet
  - stx get_stacks_payment_key "toast canal educate tissue express melody produce later gospel victory meadow outdoor hollow catch liberty annual gasp hat hello april equip thank neck cruise"
  + stx get_stacks_wallet_key "toast canal educate tissue express melody produce later gospel victory meadow outdoor hollow catch liberty annual gasp hat hello april equip thank neck cruise"
  [
  {
  "privateKey": "a25cea8d310ce656c6d427068c77bad58327334f73e39c296508b06589bc4fa201",
  