Fix to remove name on doctype

This was removed from `hast`, because only the HTML5 doctype is valid.

Author: wooorm

Diff for: lib/index.js

@@ -351,11 +351,7 @@ function comment(state, unsafe) {
 function doctype(state, unsafe) {
   if (state.schema.allowDoctypes) {
     /** @type {Doctype} */
-    const node = {
-      type: 'doctype',
-      // @ts-expect-error: To do: remove.
-      name: 'html'
-    }
+    const node = {type: 'doctype'}
 
     patch(node, unsafe)