Defining Lanczos scaler width described wrong in documentation

[Dobypeti]

Hi,
The way to define the width of the Lanczos scaler if using it is said incorrectly in the documentation. If you use the format --scaler lanczos[1-9] with [1-9] being a number in that range to define the width of the lanczos scaler, you get a crash. The format that does work is --scaler lanczos:param0=[1-9], while simply --scaler lanczos can be used for the default width of 3.

Relevant parts of the documentation:

Av1an/site/src/Cli/general.md

Line 189 in 07ae6f6

Valid scalers are based on the scalers available in [FFmpeg](https://ffmpeg.org/ffmpeg-scaler.html#toc-Scaler-Options), including `lanczos[1-9]` with `[1-9]` defining the width of the lanczos scaler.

Av1an/site/src/Cli/general.md

Line 198 in 07ae6f6

* `> av1an -i input.mkv -o output.mkv --sc-downscale-height 540 --scaler lanczos3` - Downscale to 540p using lanczos3

Av1an/av1an/src/main.rs

Lines 287 to 288 in 07ae6f6

	/// Valid scalers are based on the scalers available in ffmpeg, including
	/// lanczos[1-9] with [1-9] defining the width of the lanczos scaler.