Html component has non-existent 'content' prop listed as required

Problem/Motivation

In components/html/html.component.yml, the 'required' section references a 'content' prop, but the actual prop is named 'html'. This appears to be an oversight from a rename.

In Drupal 11, this mismatch can trigger the following error:

The component "magic_search:html" uses non-string types for properties: content.

Proposed resolution

Update the required section of html.component.yml to reference html instead of content.