Add message control directive to the changelog

Disable absolute docs link linting in the changelog. This is because the
changelog needs to include absolute docs links in order for our release
process to run smoothly, since we need to sync release notes to the
changelog.

This change removes the comment that disables the remark messaging
linter, since we have removed this custom linter in favor of Vale.

docs/pages/changelog.mdx

@@ -2,5 +2,6 @@
 title: Teleport Changelog
 description: The Changelog provides a comprehensive description of the changes introduced by each Teleport release.
 ---
-{/*lint disable messaging*/}
+{/*lint disable absolute-docs-links*/}
+
 (!CHANGELOG.md!)