doc: update buffer examples

Move the print statements below a console.log call.

Backport-PR-URL: #19244
PR-URL: #18758
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Vse Mozhet Byt <[email protected]>

Author: BridgeAR