Fixed misspelling

Author: sebastian-peter

Diff for: CHANGELOG.md

@@ -23,7 +23,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 - Fixed `MappingEntryies` not getting processed by adding `Getter` methods for record fields [#1084](https://github.com/ie3-institute/PowerSystemDataModel/issues/1084) 
 - Fixed "depth of discharge" in documentation [#872](https://github.com/ie3-institute/PowerSystemDataModel/issues/872)
-- Fixed project beiing build twice in CI [#994](https://github.com/ie3-institute/PowerSystemDataModel/issues/994)
+- Fixed project being build twice in CI [#994](https://github.com/ie3-institute/PowerSystemDataModel/issues/994)
 
 ### Changed
 - Improvements to the search for corner points in `IdCoordinateSource` [#1016](https://github.com/ie3-institute/PowerSystemDataModel/issues/1016)