chore: update link to a specific subsection of the docs

src/content/editor/extensions/functionality/fontfamily.mdx

@@ -29,7 +29,7 @@ This extension enables you to set the font family in the editor. It uses the [`T
 <CodeDemo path="/Extensions/FontFamily" />
 
 <Callout title="Heads-up!" variant="hint">
-  Be aware that `editor.isActive('textStyle', { fontFamily: 'Font Family' })` will return the font family as set by the [browser's CSS rules](https://developer.mozilla.org/en-US/docs/Web/CSS/font-family) and not as you would have expected when setting the font family.
+  Be aware that `editor.isActive('textStyle', { fontFamily: 'Font Family' })` will return the font family as set by the [browser's CSS rules](https://developer.mozilla.org/en-US/docs/Web/CSS/font-family#family-name) and not as you would have expected when setting the font family.
 </Callout>
 
 ## Install