Update crates/stackable-operator/CHANGELOG.md

Co-authored-by: Techassi <git@techassi.dev>

Author: nightkr

crates/stackable-operator/CHANGELOG.md

@@ -6,7 +6,7 @@ All notable changes to this project will be documented in this file.
 
 ### Added
 
-- Added `Hostname` and `KerberosRealmName` types extracted from secret-operator ([#851]).
+- Add `Hostname` and `KerberosRealmName` types extracted from secret-operator ([#851]).
 
 ### Changed