DOCS: List the minimum version for a feature

[webJose]

Describe the problem

I created this router for Svelte v5. Now I want to fulfill this feature to make it work with Sveltekit for hash routing, as I am not interested in meddling with Sveltekit's native routing.

In order to fulfill this, I will be adding the @sveltejs/kit package to the list of peer dependencies with the optional flag in its metadata. At this point I was confronted with the question: What's the minimum version for the features I will require, namely $app/navigation and the page reactive object from $app/state?

Describe the proposed solution

Always explicitly add, at the very beginning of the feature's documentation, the version when the feature was added.

Importance

would make my life easier

[brunnerh]

$app/navigation is older and new modules like $app/state do have version annotations in the docs at the top:

This module was added in 2.12. If you’re using an earlier version of SvelteKit, use $app/stores instead.

The same is true for newer features in the core Svelte library, e.g. MediaQuery:

Available since 5.7.0