doc: add missing YAML tag in esm.md

Refs: #41434

PR-URL: #41516
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: aduh95

doc/api/esm.md

@@ -548,7 +548,7 @@ would provide the exports interface for the instantiation of `module.wasm`.
 
 ## Top-level `await`
 
-<!--
+<!-- YAML
 added: v14.8.0
 -->