docs(5.x): update svg.md

[szymonrybczak]

Summary

Closes #928

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[szymonrybczak]

btw regarding svgs, i'd remove this section from the default config:

repack/templates_v5/rspack.config.cjs

Lines 128 to 137 in 0bc5e55

	/**
	* This loader handles all static assets (images, video, audio and others), so that you can
	* use (reference) them inside your application.
	*
	* If you want to handle specific asset type manually, filter out the extension
	* from `ASSET_EXTENSIONS`, for example:
	* ```
	* Repack.ASSET_EXTENSIONS.filter((ext) => ext !== 'svg')
	* ```
	*/

it makes it unnecessary long.

[jbroma]

1 more nit: Webpack -> webpack according to the webpack branding guidelines