[FEATURE]: Add an edit this document link to documentation pages

### Feature hasn't been suggested before.

- [x] I have verified this feature I'm about to request hasn't been suggested before.

### Describe the enhancement you want to request

Often browsing the documentation I notice small issues or typos that I would be happy to submit a pull request for, but there's no easy way to edit the document on github.

A simple link on each page would make it easier for the community to help improve the docs.