How to edit the default icon of Add Media button?

this function get_stylesheet_directory_uri() return URI to current theme’s stylesheet directory and /css/my-admin.css is path to their file which you can create in your theme directory
example :

<link rel="stylesheet" type="text/css" id="my-css" href="https://yourdomain.com/wp-content/themes/yourtheme/css/my-admin.css">

this is the output of the code in your source

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