docs(riverpod_lint): fix broken family documentation link

[JAMESMAT08]

The link to the family provider documentation in
packages/riverpod_lint/README.md points to:

https://riverpod.dev/docs/concepts/modifiers/family#passing-multiple-parameters-to-a-family

This path currently returns a 404.

This PR updates the link to the correct documentation page:

https://riverpod.dev/docs/concepts2/family

Summary by CodeRabbit

• Documentation
  • Updated the documentation link for Riverpod family rules to reflect current guidance.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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📝 Walkthrough

Walkthrough

A single documentation link in the Riverpod lint README was updated, redirecting from a specific anchor URL on the family modifiers page to a newer documentation structure at the concepts2 namespace.

Changes

Cohort / File(s)	Summary
Documentation Link Update packages/riverpod_lint/README.md	Updated warning link for Riverpod family rules from the legacy concepts/modifiers path to the new concepts2 documentation path.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• Update family.mdx #4251: Updates the target documentation page at concepts2/family.mdx, complementing this README link redirection to the newer documentation structure.

Poem

🐰 A hop through the docs, a link updated with care,
From old concepts to new, fresh information to share,
A single line changed, but paths become clear,
The family of Riverpod guides readers right here! 📚✨

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: fixing a broken documentation link related to family in the riverpod_lint package.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Merge Conflict Detection	✅ Passed	✅ No merge conflicts detected when merging into master

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✨ Finishing touches

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• Post copyable unit tests in a comment

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