docs: Add missing endpoint types to routing overview.

[nnelgxorz]

What is it?

Adds missing allowed file extensions in the Routing Overview docs.

Closes: #1061

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