[6.6 HelpHub] Browse and switch templates and template parts in the Inspector

[jennydupuy]

Draft Article: https://wordpress.org/documentation/article/template-part-block/

Update for 6.6

• [ ] [Template inspector: Surface related patterns]

General

• [ ] Make sure all screenshots are relevant to the latest version
• [ ] Make sure videos, if any, are up to date
• [ ] Add ALT tags for the images
• [ ] Make sure the headings are in sentence case
• [ ] Convert all reusable blocks to a ‘regular block’.
• [ ] Update the changelog at the end of the article