Update release docs.

docs/RELEASE.md

@@ -1,15 +1,8 @@
 # How to make a release.
 
-
-- Bump the relevant version numbers:
-  - Oasis
-  - CHANGES
-- `sh dist.sh`. It creates a tag and a branch numbered by the version.
-- Push **only the tag and not the branch**. You obtain a tag with no branch.
-- Let github create a tarball.
-- Delete the local branch.
-
-- In [ocsigen.org-data](https://github.com/ocsigen/ocsigen.org-data), copy `tyxml/dev` to the new version number.
-- Add the new version in the [download page](http://ocsigen.org/tyxml/install).
-
-- Publish on opam.
+- Update the [changelog][CHANGES.md]
+- Ensure the doc builds (`make -C docs`)
+- Run `dune-release`
+- In [ocsigen.org-data](https://github.com/ocsigen/ocsigen.org-data)
+  - Run the instructions from [how](https://github.com/ocsigen/html_of_wiki)
+  - copy `tyxml/dev` to the new version number.