fix: slugify function

[phvm]

What is the purpose of this pull request?

Fixing the table of contents slugs

What problem is this solving?

Table of content slugs having missing characters

How should this be manually tested?

Screenshots or example usage

Types of changes

• [X] 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)
• [ ] Requires change to documentation, which has been updated accordingly.

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