docs: fix a typo in the custom exceptions documentation

[sansyrox]

Description

This PR fixes a typo in the custom exceptions documentation

Summary

This PR fixes a typo in the custom exceptions documentation

PR Checklist

Please ensure that:

• The PR contains a descriptive title
• The PR contains a descriptive summary of the changes
• You build and test your changes before submitting a PR.
• You have added relevant documentation
• You have added relevant tests. We prefer integration tests wherever possible

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Name	Status	Preview	Comments	Updated (UTC)
robyn	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 26, 2024 3:00am

[codspeed-hq]

CodSpeed Performance Report

Merging #1055 will not alter performance

_{Comparing docs/exceptions (6e9013d) with main (ee507eb)}

Summary

✅ 146 untouched benchmarks