docs: typo

[Craiqser]

What is it?

• [ ] Feature / enhancement
• [ ] Bug
• [x] Docs / tests

Description

Fix typo: src/routes/some/path/_sub_component.tsx -> src/routes/some/path/sub_component.tsx (to match the file structure scheme).

Checklist:

• [x] My code follows the developer guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have made corresponding changes to the documentation
• [ ] Added new tests to cover the fix / functionality

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[shairez]

thanks @Craiqser !