Add CHANGELOG entry for opensearch-project#4779

Signed-off-by: Tyler Ohlsen <ohltyler@amazon.com>

Author: ohltyler

release-notes/opensearch-ml-commons.release-notes-3.6.0.0.md

@@ -23,6 +23,7 @@ Compatible with OpenSearch and OpenSearch Dashboards version 3.6.0
 * Escape tool name and description to handle quotation marks properly ([#4747](https://github.com/opensearch-project/ml-commons/pull/4747))
 
 ### Bug Fixes
+* Fix function calling payload for tools without input_schema attribute ([#4779](https://github.com/opensearch-project/ml-commons/pull/4779))
 * Fix SdkAsyncHttpClient resource leak in connector executors causing connection pool exhaustion ([#4716](https://github.com/opensearch-project/ml-commons/pull/4716))
 * Fix Tags.addTag() return value not captured after immutable Tags change, causing tags to be silently dropped ([#4712](https://github.com/opensearch-project/ml-commons/pull/4712))
 * Fix connection_timeout and read_timeout defaults from 30000 to 30 to match seconds unit ([#4759](https://github.com/opensearch-project/ml-commons/pull/4759))