Add changelog entries from botocore

Author: aws-sdk-python-automation

.changes/next-release/api-change-ec2-89676.json

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+{
+  "type": "api-change",
+  "category": "``ec2``",
+  "description": "[``botocore``] Documentation updates for Elastic Compute Cloud (EC2)."
+}

.changes/next-release/api-change-fms-56362.json

@@ -0,0 +1,5 @@
+{
+  "type": "api-change",
+  "category": "``fms``",
+  "description": "[``botocore``] Increases Customer API's ManagedServiceData length"
+}

.changes/next-release/api-change-s3-25277.json

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+{
+  "type": "api-change",
+  "category": "``s3``",
+  "description": "[``botocore``] Added response overrides to Head Object requests."
+}