Fixed PR number

Author: YVin3D

CHANGES.md

@@ -6,7 +6,7 @@
 
 - The property `Scene.sunColor` has been removed. Use `scene.light.color` and `scene.light.intensity` instead. [#8774](https://github.com/CesiumGS/cesium/pull/8774)
 
-- Removed `Cesium.isArray` (from file: `isArray.js`) using native `Array.isArray` instead. [#8775](https://github.com/CesiumGS/cesium/pull/8775)
+- Removed `Cesium.isArray` (from file: `isArray.js`) using native `Array.isArray` instead. [#8779](https://github.com/CesiumGS/cesium/pull/8779)
 
 ##### Additions :tada: