Fixes a link issue on the index file.

Author: jesscraze

articles/signups/index.yml

@@ -1,7 +1,7 @@
 ### YamlMime:Landing
 
 title: Azure startup credit offer documentation
-summary: Eligible startups can receive $1,000 USD in Azure credits to explore the latest AI models and start building on Azure. Get started at [microsoft.com/startups](https://microsoft.com/startups).
+summary: Eligible startups can receive $1,000 USD in Azure credits to explore the latest AI models and start building on Azure. Get started at microsoft.com/startups.
 
 metadata:
   title: Azure startup credit offer documentation | Microsoft Learn # Required; page title displayed in search results. Include the brand. < 60 chars.