Updating HTML pertains only to SVG icon. Content switcher with icon is no longer supported.
Vanilla markup should be migrated to one shown in carbondesignsystem.com site. React and other framework variants should reflect the change automatically.
New Markup:
No longer supporting content switcher with icon
Old Markup:
<svg
class="bx--content-switcher__icon"
width="16"
height="16"
viewBox="0 0 16 16"
xmlns="http://www.w3.org/2000/svg"
>
<path
d="M7 7H4v2h3v3h2V9h3V7H9V4H7v3zm1 9A8 8 0 1 1 8 0a8 8 0 0 1 0 16z"
fill-rule="evenodd"
/>
</svg>
No selector changes.