Change Stripe config instructions in spree.rb initializer template

for solidus_stripe versions < 5.0

core/lib/generators/solidus/install/templates/config/initializers/spree.rb.tt

@@ -38,7 +38,9 @@ Spree.config do |config|
  #
  # Please note that you need to use the solidus_stripe gem to have
  # Stripe working: https://github.com/solidusio-contrib/solidus_stripe
- #
+ # Instructions can be found in the solidus_stripe initializer or here
+ # if you are using solidus_stripe < 5.0.x
+ # 
  # config.static_model_preferences.add(
  # Spree::PaymentMethod::StripeCreditCard,
  # 'stripe_env_credentials',