Fix edit link in documentation (#6055)

Previously, the edit links always showed a 404
as the `master` branch is not used anymore.
Now, the link is updated to use the current `main` branch.

Author: DanielHabenicht

mkdocs.yml

@@ -109,5 +109,6 @@ nav:
           - contributing.md
           - contributing_docs.md
           - bounty.md
+edit_uri: edit/main/docs/
 extra:
     latest_version: 1.17.5