Merge branch 'main' of https://github.com/ueberdosis/tiptap-next into feature/replace-classes

# Conflicts:
#	docs/src/demos/Examples/Focus/index.vue
#	docs/src/docPages/api/extensions/placeholder.md
#	docs/src/docPages/general/roadmap.md

docs/src/docPages/api/extensions/underline.md

@@ -2,7 +2,9 @@
 Enables you to use the `<u>` HTML tag in the editor.
 
 ## Options
-*None*
+| Option | Type | Default | Description |
+| ------ | ---- | ------- | ----------- |
+| class | string | – | Add a custom class to the rendered HTML tag. |
 
 ## Commands
 | Command | Options | Description |