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docs: describe screen mirroring with wl-mirror (#2633)

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* docs: describe screen mirroring with wl-mirror

* docs: apply wording suggestions for wl-mirror section

* Update docs/wiki/Screencasting.md

* Update docs/wiki/Screencasting.md

---------

Co-authored-by: Ivan Molodetskikh <yalterz@gmail.com>
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haansn08
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@@ -137,4 +137,17 @@ Here's an example showing a windowed-fullscreen Google Slides [presentation](htt
![Windowed Google Slides presentation, another window showing the presenter view, and another window showing Zoom UI casting the presentation.](https://github.com/user-attachments/assets/b2b49eea-f5a0-4c0a-b537-51fd1949a59d)
### Screen mirroring
For presentations it can be useful to mirror an output to another.
Currently, niri doesn't have built-in output mirroring, but you can use a third-party tool [`wl-mirror`](https://github.com/Ferdi265/wl-mirror) that mirrors an output to a window.
Note that the command below requires [`jq`](https://jqlang.org/download/) to be installed.
```kdl
binds {
Mod+P repeat=false { spawn-sh "wl-mirror $(niri msg --json focused-output | jq -r .name)"; }
}
```
Focus the output you want to mirror, press <kbd>Mod</kbd><kbd>P</kbd> and move the `wl-mirror` window to the target output.
Finally, fullscreen the `wl-mirror` window (by default, <kbd>Mod</kbd><kbd>Shift</kbd><kbd>F</kbd>).
[OBS]: https://obsproject.com/