Fixed intro text and link when joining section.

Author: rlhawk

dashboard/app/views/followers/student_user_new.html.haml

@@ -11,9 +11,9 @@
   %h2 Register to join the class #{@section.name} taught by #{@section.user.name}
   %p
     If you already have an account at Code.org, please
-    %a{href: "http://#{request.site}/users/sign_in?return_to=http://#{request.site}/join/#{params[:section_code]}"} sign into your account
+    %a{href: "http://#{canonical_hostname('studio.code.org')}/users/sign_in?return_to=http://#{canonical_hostname('studio.code.org')}/join/#{params[:section_code]}"} sign into your account
     before joining the section.
-  %p If you don't have an account at Code.org yet, please fill out the fields below to create an account and join the section.
+  %p{style: "margin-bottom: 30px;"} If you don't have an account at Code.org yet, please fill out the fields below to create an account and join the section.
   - if @user.errors.any?
     #error_explanation
       %ul