docs: Update reference from `success` to `empty`

[vwkd]

Remove reference to success deprecated in #440.

[coveralls]

Pull Request Test Coverage Report for Build 7830406703

Warning: This coverage report may be inaccurate.

We've detected an issue with your CI configuration that might affect the accuracy of this pull request's coverage report. To ensure accuracy in future PRs, please see these guidelines. A quick fix for this PR: rebase it; your next report should be accurate.

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.03%) to 42.635%

---

Files with Coverage Reduction	New Missed Lines	%
src/token/mod.rs	1	75.53%
<!--	Total:	1		-->

Totals
Change from base Build 7819097216:	-0.03%
Covered Lines:	1317
Relevant Lines:	3089

---

💛 - Coveralls

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (338b15d) 0.00% compared to head (9f55aef) 42.76%.

:exclamation: Current head 9f55aef differs from pull request most recent head da57471. Consider uploading reports for the commit da57471 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #466 +/- ## ========================================= + Coverage 0 42.76% +42.76% ========================================= Files 0 18 +18 Lines 0 3089 +3089 ========================================= + Hits 0 1321 +1321 - Misses 0 1768 +1768 ```

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[epage]

Thanks!