Fix docstring Args entries that name a parameter the class does not take - #5326

Six Args: entries name something the callable does not take.

Four are the PaidMedia subclasses. Each documents type under Args:, but none of their __init__ takes it: super().__init__(type=PaidMedia.PREVIEW) and so on. MessageOrigin* is built exactly the same way and documents type only under Attributes:, which is what made me read these as a slip rather than a house style. The Attributes: entry stays in all four.

decrypt documents a file argument it does not have, and ApplicationBuilder.get_updates_proxy documents proxy, copied from the proxy method above it. That one had to be rewrapped to stay under 99 characters.

ruff check and ruff format --check are clean on the three files with the pinned ruff==0.16.0. If the type entries are deliberate I will drop that part of the change.