docs(docs): 📝 add missing command docs

docs/api/commands/set-mark.md

@@ -1,5 +1,17 @@
 # setMark
+The `setMark` command will add a new mark at the current selection.
 
-:::warning
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-:::
+## Parameters
+
+`typeOrName: string | MarkType`
+
+The type of a mark to add. Can be a string or a MarkType.
+
+`attributes: Record<string, any>`
+
+The attributes that should be applied to the mark. **This is optional.**
+
+## Usage
+```js
+editor.commands.setMark("bold", { class: 'bold-tag' })
+```