[Docs] Fixed broken internal doc links

[lisa-tarbo]

Product Description

Doc changes only. No code changes

Technical Description

5 Internal doc Links fixed.
I "broke" links when moving docs into a folder

Test

uv run zensical serve --strict

Docs and Changelog

• This PR requires docs/changelog update

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Run ID: 4f0cd8d4-87bd-492e-a11a-32fffd71a564

📥 Commits

Reviewing files that changed from the base of the PR and between e772a0b and c41549c.

📒 Files selected for processing (3)

• docs/developer_guides/code_systems/feature_flags.md
• docs/developer_guides/feature_deprecation.md
• docs/developer_guides/managing_models.md

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📝 Walkthrough

Walkthrough

This pull request corrects relative link paths in three documentation files. In feature_flags.md, a link to the admin guide is fixed to use the correct number of parent directory traversals. In feature_deprecation.md, three links (notifications, object versioning, data migrations) are updated to fully-qualified relative paths. In managing_models.md, a link to the notifications guide is similarly updated. No code logic or exported entities are affected.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Possibly related PRs

• dimagi/open-chat-studio#3537: Introduces the feature_deprecation.md guide whose links are corrected in this PR.
• dimagi/open-chat-studio#3672: Also updates documentation link paths related to the Feature Flags guide under developer_guides/code_systems/.

Suggested reviewers: snopoke, SmittieC

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly matches the PR’s main change: fixing broken internal documentation links.
Description check	✅ Passed	The description includes product and technical summaries plus test notes, and it largely matches the template.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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