docs: update release notes

code/web/release_notes/24.12.00.MD

@@ -45,6 +45,12 @@
 // alexander - PTFSE
 
 // Chloe - PTFSE
+- LibKey (ThirdIron) integration:
+  - Add LibKey Settings under Third Party Enhancement (*CZ*)
+  - LibKey Settings can be associated with specific libraries (*CZ*)
+  - Add an 'Administer LibKey Settings' permission (*CZ*)
+  - For eContent records with DOIs, the 'Access Online' button will default to a LibKey-issued direct link to the document if the active library has a LibKey subscription and if the record is found by LibKey (*CZ*)
+  - LibKey links are also added under 'Links' on the detailed view for a record (*CZ*)
 
 // Lucas - Theke