Add header links in changelogs

[Goooler]

Follow up #2196.

[Goooler]

@nedtwigg I guess this should be covered from com.diffplug.spotless-changelog side. A bug or a new feature?

[nedtwigg]

What functionality do these Changelog things have that this URL does not?

• https://github.com/diffplug/spotless/releases

My view is that CHANGELOG.md should be as simple as possible, and other tools like e.g. GitHub releases can make it "richer", but I don't think we need to pull that complexity into the changelog itself.

[Goooler]

These links point to the releases on GitHub Web, if we don't need them, should keep the formats like ## 3.0.0.BETA2 - 2024-08-25 instead of #[3.0.0.BETA2] - 2024-08-25.

[nedtwigg]

I'm following this convention: https://keepachangelog.com/en/1.1.0/

[Goooler]

Yeah, I noticed. But header links are used in this convention for displaying links in titles and keep the format concise, like this:

We don't have these links, therefore [] looks redundant. But anyway, such a small thing.