message: docs: Clarifying testing instructions
diff: @@ -18,7 +18,8 @@ request is opened. All sets of tests can also be run locally.
  # Running tests locally
  -Build for your system first. Be sure to enable wallet, utils and daemon when you configure. Tests will not run otherwise.
  +Before tests can be run locally, Bitcoin Core must be built. See the [building instructions](/doc#building) for help.
  +
  ### Functional tests
  