Docs: remove outdated link to change notes.

The change notes are now maintained under each query pack, so there's no
single place where we can link to it.

Author: jbj

docs/supported-queries.md

@@ -3,7 +3,7 @@
 Queries and libraries outside [the `experimental` directories](experimental.md) are _supported_ by GitHub, allowing our users to rely on their continued existence and functionality in the future:
 
 1. Once a query has appeared in a stable release, a one-year deprecation period is required before we can remove it.
-2. Major changes to supported queries and libraries are always announced in the [change notes for stable releases](../change-notes/).
+2. Major changes to supported queries and libraries are always announced in the change notes for stable releases.
 3. We will do our best to address user reports of false positives or false negatives.
 
 Because of these commitments, we set a high bar for accepting new supported queries. The requirements are detailed in the rest of this document.