Fix type guard for html

Author: wooorm

lib/index.js

@@ -1,4 +1,5 @@
 /**
+ * @typedef {import('mdast').Html} Html
  * @typedef {import('mdast').PhrasingContent} PhrasingContent
  */
 
@@ -16,12 +17,13 @@ import {convert} from 'unist-util-is'
  */
 
 export const phrasing =
-  /** @type {(node?: unknown) => node is PhrasingContent} */
+  /** @type {(node?: unknown) => node is Exclude<PhrasingContent, Html>} */
   (
     convert([
       'break',
       'delete',
       'emphasis',
+      // To do: next major: removed since footnotes were added to GFM.
       'footnote',
       'footnoteReference',
       'image',