docs: Dead edit this page link #809
Description
When clicking "edit this page" button in the documentation I'm redirected to
https://github.com/scylladb/java-driver/edit/scylla-4.x/docs/source/...
(ex. https://github.com/scylladb/java-driver/edit/scylla-4.x/docs/source/manual/index.md link opened when clicking edit on this page: https://java-driver.docs.scylladb.com/stable/manual/index.html ), which is a dead link.
It probably should point to https://github.com/scylladb/java-driver/edit/scylla-4.x/manual (ex. https://github.com/scylladb/java-driver/edit/scylla-4.x/manual/README.md)