doc: use 'console' info string for console output

Trott · BethGriggs · commit e4679bd45d93 · 2020-08-24T12:19:57.000+01:00
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
@@ -1895,7 +1895,7 @@ 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!
