add descriptive alt text (#1068)

Author: ethanpalm

contact-support.mdx

@@ -16,7 +16,7 @@ Visit our [YouTube](https://www.youtube.com/@GetMintlify/videos) channel for tut
 
 Send us a message from your [dashboard](https://dashboard.mintlify.com/) by selecting **Support** in the sidebar.
 
-![Support flow](https://mintlify.s3.us-west-1.amazonaws.com/mintlify/images/support-flow.gif)
+![Gif showing how to access support from the dashboard by selecting the Support button, then selecting an option and typing a question in the support modal that pops up.](https://mintlify.s3.us-west-1.amazonaws.com/mintlify/images/support-flow.gif)
 
 <Info>
 We aim to respond to all requests within 24 hours, but delays may occur during busy times.