Using Markdown for descriptions

Postman supports Markdown as a way to style text descriptions for requests, collections, and folders within collections. You can even embed screenshots and other images for more descriptive flair.

Review reference for using Markdown in API documentation. 

Postman renders this markdown in the following places:

In the request builder, the request description can be styled with markdown.
request description

The collections details view can be styled with markdown in the descriptions for collections and folders.
collection details view

For either public or internal API documentation, automatically generated API descriptions (Pro feature) will be styled beautifully and precisely with markdown.
automatically generated documentation