Previously, anchor links were only available in sequential number format (e.g., 'ruffruff-table-of-contents-1', 'ruffruff-table-of-contents-2', ...), but we've added the ability to generate them using headings instead. Using headings for anchor links can be expected to have a more positive effect on SEO.
Generating anchor links using headings is available starting from the Light Plan.

Settings Location|Anchor Links Using Headings