tutorials with slug ending in `-` return 404 error

~~Navigate to `directus.com/docs` and use the search feature (⌘+K) to search for "Build a user feedback widget":~~ I originally thought it was a search bug but it's actually just a slug bug. 🚗

You'll get a `404` to: https://directus.com/docs/tutorials/projects/build-a-user-feedback-widget-with-vue-js-

Reproduce the 404 by opening the Directus documentation URL for “Build a user feedback widget” and compare it with the tutorial found through the docs search feature. Trace where the tutorial slug is defined or generated, then verify that the page no longer returns 404 when its slug ends without an extra hyphen.

Written by the indexing model from the issue text.