Revert "remove region unsupported message for Sendgrid and Mandrill (#3478)" (#3480)

This reverts commit cc85ad6.

Author: markzegarelli

src/connections/sources/catalog/cloud-apps/mandrill/index.md

@@ -2,6 +2,7 @@
 title: Mandrill Source
 id: asdf76as89
 ---
+{% include content/source-region-unsupported.md %}
 
 [Mandrill](http://www.mandrill.com/) is a transactional email API for MailChimp users.
 

src/connections/sources/catalog/cloud-apps/sendgrid/index.md

@@ -2,6 +2,7 @@
 title: SendGrid Source
 id: jhr8dT2yHn
 ---
+{% include content/source-region-unsupported.md %}
 
 [SendGrid](http://sendgrid.com) is a trusted platform for transactional email and email marketing.