Tweak a changelog entry

Author: bbatsov

CHANGELOG.md

@@ -50,7 +50,7 @@
   - Introduces Timbre compatibility for [CIDER Log Mode](https://docs.cider.mx/cider/debugging/logging.html).
   - Fixes JS completions for nested objects.
   - Bundles other fixes and reliability improvements.
-- [#840](https://github.com/clojure-emacs/cider-nrepl/pull/840): Drop support for Clojure 1.8.
+- [cider-nrepl#840](https://github.com/clojure-emacs/cider-nrepl/pull/840): Drop support for Clojure 1.8.
 
 ## 1.12.0 (2023-11-24)