docker: add missing word in README

docker/README.md

@@ -278,7 +278,7 @@ bitcoins. The schema will be following:
  to "Faucet" than already created "btcd" node would be sufficient.
 ```
 
-First of all you need to run `btcd` node in `testnet` and wait it to be 
+First of all you need to run `btcd` node in `testnet` and wait for it to be 
 synced with test network (`May the Force and Patience be with you`).
 ```bash 
 # Init bitcoin network env variable: