doc: use 'console' info string for console output

Trott · addaleax · commit 5f09f45d1f25 · 2020-09-22T19:56:00.000+02:00
PR-URL: #34837 Reviewed-By: Michaël Zasso <targos@protonmail.com> Reviewed-By: Richard Lau <riclau@uk.ibm.com>
diff --git a/doc/api/esm.md b/doc/api/esm.md
@@ -1808,7 +1808,7 @@ requires the full path to a module be provided to the loader. To enable the
 automatic extension resolution and importing from directories that include an
 index file use the `node` mode.
 
-```bash
+```console
 $ node index.mjs
 success!
 $ node index # Failure!
