Add changelog entry for fixing of gh-1901

Author: oleksandr-pavlyk

CHANGELOG.md

@@ -21,6 +21,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Fix for `tensor.result_type` when all inputs are Python built-in scalars [gh-1877](https://github.com/IntelPython/dpctl/pull/1877)
 * Improved error in constructors `tensor.full` and `tensor.full_like` when provided a non-numeric fill value [gh-1878](https://github.com/IntelPython/dpctl/pull/1878)
 * Added a check for pointer alignment when copying to C-contiguous memory [gh-1890](https://github.com/IntelPython/dpctl/pull/1890)
+* Fixed incorrect result (issue [gh-1901](https://github.com/IntelPython/dpctl/issues/1901)) in `tensor.cumulative_sum` and in advanced indexing [gh-1902](https://github.com/IntelPython/dpctl/pull/1902)
 
 ### Maintenance