EC-1181 Update PayPal setup tooltip with correct developer dashboard link and REST API docs link (#16)

Author: lee-farrell-lu

app/views/spree/admin/payment_methods/configuration_guides/_spree_paypal_checkout.html.erb

@@ -1,6 +1,7 @@
 <div class="alert alert-info">
   <p class="mb-0">
     To find your <strong>Client ID</strong> and <strong>Client Secret</strong>, go to the 
-    <%= external_link_to 'PayPal dashboard', 'https://www.paypal.com/mep/merchantapps/setup/checkout/apicredentials', class: 'alert-link' %>
+    <%= external_link_to 'PayPal Developer Dashboard', 'https://developer.paypal.com/dashboard/', class: 'alert-link' %>.
+    For more information, see the <%= external_link_to 'PayPal REST API documentation', 'https://developer.paypal.com/api/rest/', class: 'alert-link' %>.
   </p>
 </div>