Docs: fix out-dated CLI option in Manim's Output Settings (#3674)

* Docs: fix out-dated CLI option in Manim's Output Settings

* Docs: more fluent English

Co-authored-by: adeshpande <110117391+JasonGrace2282@users.noreply.github.com>

* Docs: break lines

* Docs: more fluent English

* Docs: remove a space

Co-authored-by: adeshpande <110117391+JasonGrace2282@users.noreply.github.com>

---------

Co-authored-by: adeshpande <110117391+JasonGrace2282@users.noreply.github.com>
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@ -276,25 +276,28 @@ When executing the command
manim -pql scene.py SquareToCircle
it was necessary to specify which ``Scene`` class to render. This is because a
single file can contain more than one ``Scene`` class. If your file contains
multiple ``Scene`` classes, and you want to render them all, you can use the
``-a`` flag.
it specifies the scene to render. This is not necessary now. When a single
file contains only one ``Scene`` class, it will just render the ``Scene``
class. When a single file contains more than one ``Scene`` class, manim will
let you choose a ``Scene`` class. If your file contains multiple ``Scene``
classes, and you want to render them all, you can use the ``-a`` flag.
As discussed previously, the ``-ql`` specifies low render quality. This does
not look very good, but is very useful for rapid prototyping and testing. The
other options that specify render quality are ``-qm``, ``-qh``, and ``-qk`` for
medium, high, and 4k quality, respectively.
As discussed previously, the ``-ql`` specifies low render quality (854x480
15FPS). This does not look very good, but is very useful for rapid
prototyping and testing. The other options that specify render quality are
``-qm``, ``-qh``, ``-qp`` and ``-qk`` for medium (1280x720 30FPS), high
(1920x1080 60FPS), 2k (2560x1440 60FPS) and 4k quality (3840x2160 60FPS),
respectively.
The ``-p`` flag plays the animation once it is rendered. If you want to open
the file browser at the location of the animation instead of playing it, you
can use the ``-f`` flag. You can also omit these two flags.
Finally, by default manim will output .mp4 files. If you want your animations
in .gif format instead, use the ``-i`` flag. The output files will be in the
same folder as the .mp4 files, and with the same name, but a different file
extension.
in .gif format instead, use the ``--format gif`` flag. The output files will
be in the same folder as the .mp4 files, and with the same name, but a
different file extension.
This was a quick review of some of the most frequent command-line flags. For a
thorough review of all flags available, see the
:doc:`thematic guide on Manim's configuration system </guides/configuration>`.
This was a quick review of some of the most frequent command-line flags.
For a thorough review of all flags available, see the :doc:`thematic guide on
Manim's configuration system </guides/configuration>`.