doc: add missing "changes" key in YAML comment

PR-URL: #18605
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Anatoli Papirovski <[email protected]>

Author: lpinca

doc/api/http.md

@@ -1666,6 +1666,7 @@ Found'`.
 ## http.createServer([options][, requestListener])
 <!-- YAML
 added: v0.1.13
+changes:
   - version: REPLACEME
     pr-url: https://github.com/nodejs/node/pull/15752
     description: The `options` argument is supported now.