Hey there, first time contributing and I'm in the middle of reading the contribution best practice, so sorry for any mistakes in this pull request. 

When clicking the **Contributing section** link under the **Contributors guidelines** title, this linked to the Godot *page not found* link.

I changed the link from `https://docs.godotengine.org/en/latest/contributing/ways_to_contribute.html` to `https://docs.godotengine.org/en/latest/contributing/how_to_contribute.html`.

Now, when a user clicks the link, it will redirect them to the start of the contribution documentation.