chore: update command

editor.first -> editor.commands.first

src/content/editor/api/commands/index.mdx

@@ -176,7 +176,7 @@ If you want to run a list of commands, but want only the first successful comman
 For example, the backspace key tries to undo an input rule first. If that was successful, it stops there. If no input rule has been applied and thus can’t be reverted, it runs the next command and deletes the selection, if there is one. Here is the simplified example:
 
 ```js
-editor.first(({ commands }) => [
+editor.commands.first(({ commands }) => [
   () => commands.undoInputRule(),
   () => commands.deleteSelection(),
   // …