1. The motivation for making this change (or link the relevant issues)

trying to get help on Scene.play leads to a dead end, because the handle_play_like_call decorator fails to take care of its outcome's docstring (and other special attributes like __name__ I would bet)

the good practice for writing such decorator is to take advantage of functools.wraps, this PR exhibits one example; let me know what you think and I could review the code more deeply to account for the other possible places where that change could come in handy

this way, decorated methods - typically Scene.play - have a decent docstring
so first-time users can use help() on them

2. How you tested the new behavior (e.g. a minimal working example, before/after
   screenshots, gifs, commands, etc.) This is rather informal at the moment, but
   the goal is to show us how you know the pull request works as intended.

well, I'm a first time user, and I've been using this brew of manim for my first steps, and have not met any unexpected result so far, as compared to what the tutorial shows