Icon: Improve `icon` prop usage docs in Storybook #120258

Job	Run time
JavaScript (Node.js 20) 1/4	1m 24s
JavaScript Date Tests (Node.js 20)	51s
JavaScript (Node.js 20) 2/4	1m 23s
JavaScript (Node.js 20) 3/4	1m 24s
JavaScript Date Tests (Node.js 22)	39s
JavaScript (Node.js 20) 4/4	1m 25s
Build JavaScript assets for PHP unit tests	1m 24s
JavaScript (Node.js 22) 1/4	1m 23s
JavaScript (Node.js 22) 2/4	1m 23s
JavaScript (Node.js 22) 3/4	1m 23s
Compute previous WordPress version	3s
JavaScript (Node.js 22) 4/4	1m 23s
Mobile	1m 23s
PHP coding standards	17s
PHP ${{ matrix.php }}${{ ((matrix.multisite && ' multisite') \|\| '') }}${{ (((matrix.wordpress != '') && format(' (WP {0}) ', matrix.wordpress)) \|\| '') }} on ubuntu-latest	1s
PHP	1s
	15m 47s

Provide feedback