Update features/system_specs/system_specs.feature

Co-authored-by: Jon Rowe <mail@jonrowe.co.uk>

Author: johnpitchko

features/system_specs/system_specs.feature

@@ -19,9 +19,11 @@ Feature: System specs
 
   RSpec **does not** use your `ApplicationSystemTestCase` helper. Instead it
   uses the default `driven_by(:selenium)` from Rails. If you want to override
-  this behaviour you can call `driven_by` manually in a test. Alternatively, 
-  if you want to specify a default driver for all system specs (rather than
-  using `driven_by` in every spec), add the following to `spec/rails_helper.rb`:
+  this behaviour you need to call `driven_by` in your specs.
+
+  This can either be done manually in the spec files themselves or
+  you can use the configuration helpers to do this for every system spec,
+  for example by adding the following to `spec/rails_helper.rb`:
 
   ```
   config.before(type: :system) do