fix changelog link

CHANGELOG.md

@@ -3,7 +3,7 @@
 - **15-Jan-2022**: 
   - A bugfix in the GL backend for uniform arrays using the 'native' uniform block layout.
     The bug was a regression in the recent 'uniform data handling' update. See
-    PR #611 for details, and this [new sample/test](https://github.com/floooh/sokol-samples/blob/master/glfw/uniformarrays-glfw.c).
+    [PR #611](https://github.com/floooh/sokol/pull/611) for details, and this [new sample/test](https://github.com/floooh/sokol-samples/blob/master/glfw/uniformarrays-glfw.c).
     Many thanks to @nmr8acme for the PR!
   
 - **08-Jan-2022**: some enhancements and cleanup to uniform data handling in sokol_gfx.h