Update CHANGES.md

Author: tfili

CHANGES.md

@@ -15,7 +15,7 @@ Change Log
 * Fixed a bug where image requests that returned HTTP code 204 would prevent any future request from succeeding on browsers that supported ImageBitmap. [#7914](https://github.com/AnalyticalGraphicsInc/cesium/pull/7914/)
 * Fixed polyline colors when `scene.highDynamicRange` is enabled. [#7924](https://github.com/AnalyticalGraphicsInc/cesium/pull/7924)
 * Fixed a bug in the inspector where the min/max height values of a picked tile were undefined. [#7904](https://github.com/AnalyticalGraphicsInc/cesium/pull/7904)
-* Fixed Math.factorial to return the correct values. (https://github.com/AnalyticalGraphicsInc/cesium/pull/7969)
+* Fixed `Math.factorial` to return the correct values. (https://github.com/AnalyticalGraphicsInc/cesium/pull/7969)
 
 ### 1.58.1 - 2018-06-03
 _This is an npm-only release to fix a publishing issue_.