Remove multiple complementary landmarks from widgets

[alexstine]

On a developer handbook page, there are multiple complementary landmarks injected by widgets.

Example page: ​https://developer.wordpress.org/block-editor/

Problem code:

<div id="secondary" class="widget-area" role="complementary">
		<div id="secondary-content">
				<aside id="search-7" class="widget widget_search">
				</aside>
				<aside id="handbook_pages-3" class="widget widget_wporg_handbook_pages">
				</aside>
		</div>
</div>

Solution: Since there is already a wrapping ARIA role, remove the aside tags and replace them with divs or another HTML element. Aside tag is HTML5 and produces a complementary landmark when used.