Update CHANGES.md

Co-authored-by: Gabby Getz <[email protected]>

Author: kiselev-dv

CHANGES.md

@@ -16,7 +16,7 @@
 - Fixed a crash that occurred in `ModelExperimental` when loading a Draco-compressed model with tangents. [#10294](https://github.com/CesiumGS/cesium/pull/10294)
 - Fixed an incorrect model matrix computation for `i3dm` tilesets that are loaded using `ModelExperimental`. [#10302](https://github.com/CesiumGS/cesium/pull/10302)
 - Fixed race condition during billboard clamping when the height reference changes. [#10191](https://github.com/CesiumGS/cesium/issues/10191)
-- Fixed `Expreession` multi-variable substitution. [#12455](https://github.com/CesiumGS/cesium/issues/12455)
+- Fixed `Expression` multi-variable substitution. [#12455](https://github.com/CesiumGS/cesium/issues/12455)
 
 ### 1.92 - 2022-04-01