Update postman.md

Deleted 404 link for now

Author: symbldoc

docs/developer-tools/postman.md

@@ -11,10 +11,4 @@ Postman is a desktop and web application that allows you to send HTTP requests f
 
 You need to have `appId` and `appSecret` to use authenticate before you can run any APIs.  You can find your account credentials on [platform home](https://platform.symbl.ai)
 
-## How to use Symbl postman collection?
-
-<p align="left">
-<iframe width="850" height="550" src="https://www.loom.com/embed/407fff46c55344cdae176f10ddb5f3c0" frameborder="0" allowfullscreen mozallowfullscreen ></iframe>
-</p>
-
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