Incorrect Output settings documentation

The docs at [Manim's Output Settings](https://docs.manim.community/en/stable/tutorials/output_and_config.html#some-command-line-flags) are outdated. A couple examples:
> When executing the command `manim -pql scene.py SquareToCircle` it was necessary to specify which Scene class to render.

>  If you want your animations in .gif format instead, use the -i flag. 