fix(docs): use updated usage of doc_auto_cfg and fix internal link

[sermuns]

Description

The docs are failing for git-cliff-core.

https://docs.rs/crate/git-cliff-core/latest

This PR addresses that.

I also noticed there was a broken internal link, which I resoled by using the fully qualified path.

Motivation and Context

rust-lang/rfcs#3631 has been merged, which removes #![cfg_attr(docsrs, feature(doc_auto_cfg))].

How Has This Been Tested?

According to https://docs.rs/about/builds, docs.rs uses nightly-2026-02-13 to build docs.

I ran

RUSTDOCFLAGS="--cfg docsrs" cargo +nightly-2026-02-13 doc --all-features --no-deps

and no warnings or errors showed, so it seems to work?

Screenshots / Logs (if applicable)

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly (if applicable).
• I have formatted the code with rustfmt.
  • cargo +nightly fmt --all
• I checked the lints with clippy.
  • cargo clippy --tests --verbose -- -D warnings
• I have added tests to cover my changes.
• All new and existing tests passed.
  • cargo test

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47.67%. Comparing base (cbf2115) to head (ddd9449).
⚠️ Report is 68 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1373   +/-   ##
=======================================
  Coverage   47.67%   47.67%           
=======================================
  Files          24       24           
  Lines        2117     2117           
=======================================
  Hits         1009     1009           
  Misses       1108     1108           

Flag	Coverage Δ
unit-tests	47.67% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[orhun]

thx!

[welcome]

Congrats on merging your first pull request! ⛰️