docs(button): fix flex alignment stretching buttons

Fix Storybook display issue where buttons will stretch to the height
of the tallest button, in the template where multiple buttons are
displayed in a row. This was changing how they are actually displayed.

Author: jawinn

components/button/stories/button.stories.js

@@ -309,6 +309,7 @@ const Treatment = (args) =>
 <div
 	style=${styleMap({
 		display: "flex",
+		alignItems: "flex-start",
 		gap: "10px",
 	})}
 	id="render-root"
@@ -457,6 +458,7 @@ const Variants = (args) =>
 	style=${styleMap({
 		display: "flex",
 		gap: "10px",
+		alignItems: "flex-start",
 	})}
 	id="render-root"
 >${CustomButton(args)}</div>`}`;