The warning causes messages to be spammed if you are calling this
method in a game that runs on both desktop and mobile platforms,
unless you guard all calls to `Input.vibrate_handheld()` with
`OS.has_feature("mobile") or OS.has_feature("web")`.
Since the limitation is already documented (and is obvious enough
given the method's name), the warning message is redundant.
(cherry picked from commit 4a991887bf)