fix docs for createTx

lib/server.js

@@ -1848,14 +1848,14 @@ WalletService.prototype._validateAndSanitizeTxOpts = function(wallet, opts, cb)
  * @param {number} opts.outputs[].amount - Amount to transfer in satoshi.
  * @param {string} opts.outputs[].message - A message to attach to this output.
  * @param {string} opts.message - A message to attach to this transaction.
- * @param {Array} opts.inputs - Optional. Inputs for this TX
- * @param {string} opts.fee - Optional. Use an alternative fee for this TX (mutually exclusive with feePerKb)
- * @param {string} opts.feePerKb - Optional. Use an alternative fee per KB for this TX (mutually exclusive with fee)
+ * @param {string} opts.feePerKb - Use an alternative fee per KB for this TX.
  * @param {string} opts.sendMax - Optional. Send maximum amount of funds that make sense under the specified fee/feePerKb conditions. (defaults to false).
  * @param {string} opts.payProUrl - Optional. Paypro URL for peers to verify TX
  * @param {string} opts.excludeUnconfirmedUtxos[=false] - Optional. Do not use UTXOs of unconfirmed transactions as inputs
  * @param {string} opts.validateOutputs[=true] - Optional. Perform validation on outputs.
  * @param {string} opts.dryRun[=false] - Optional. Simulate the action but do not change server state.
+ * @param {Array} opts.inputs - Optional. Inputs for this TX
+ * @param {number} opts.fee - Optional. Use an fixed fee for this TX (only when opts.inputs is specified)
  * @returns {TxProposal} Transaction proposal.
  */
 WalletService.prototype.createTx = function(opts, cb) {