Link to rendered AsciiDoc release notes

[hickford]

Currently the release notes link takes you to raw AsciiDoc https://raw.githubusercontent.com/git/git/6ab38b7e9cc7adafc304f3204616a4debd49c6e9/Documentation/RelNotes/2.52.0.adoc

It would nice to link to rendered release notes instead, these are easier to read https://github.com/git/git/blob/master/Documentation/RelNotes/2.52.0.adoc

[dscho]

@hickford sure! How about opening a PR? The files that need patching can be found here.