add changelogs

.changelog/24113a10aa884c7dbef8b7c9989da291.json

@@ -0,0 +1,8 @@
+{
+    "id": "24113a10-aa88-4c7d-bef8-b7c9989da291",
+    "type": "feature",
+    "description": "**BREAKFIX**: Correct nullability of InitialCapacityConfig's WorkerCount field. The type of this value has changed from int64 to *int64. Due to this field being marked required, with an enforced minimum of 1, but a default of 0, the former type would result in automatic failure behavior without caller intervention. Calling code will need to be updated accordingly.",
+    "modules": [
+        "service/emrserverless"
+    ]
+}

.changelog/d4bc92a6c4064c22bd2b44f9a82587ce.json

@@ -0,0 +1,8 @@
+{
+    "id": "d4bc92a6-c406-4c22-bd2b-44f9a82587ce",
+    "type": "feature",
+    "description": "**BREAKFIX**: Correct nullability of GetExperimentResultsInput's Period field. The type of this value has changed from int64 to *int64. Due to the nature of default value serialization, the former type could cause unexpected/incorrect behavior when set to its zero value. Calling code will need to be updated accordingly.",
+    "modules": [
+        "service/evidently"
+    ]
+}