Add changelog entries for Own-related additions (#954)

Author: leo

CHANGELOG.md

@@ -13,6 +13,9 @@ All notable changes to `src-cli` are documented in this file.
 
 ### Added
 
+- `src team` (experimental) has been added to manage teams. [#922](https://github.com/sourcegraph/src-cli/pull/922)
+- `src codeowners` (experimental) has been added to manage manually ingested `CODEOWNERS`. [#943](https://github.com/sourcegraph/src-cli/pull/943)
+
 ### Changed
 
 ### Fixed