fix release notes typo (#1326) (#1327)

(cherry picked from commit 96f9fdc)

Signed-off-by: Jackie Han <jkhanjob@gmail.com>
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

release-notes/opensearch-anomaly-detection.release-notes-2.17.0.0.md

@@ -9,6 +9,6 @@ Compatible with OpenSearch 2.17.0
 ### Enhancements
 * Fix inference logic and standardize config index mapping ([#1284](https://github.com/opensearch-project/anomaly-detection/pull/1284))
 
-### Big Fixes
+### Bug Fixes
 * Prevent resetting the latest flag of real-time when starting historical analysis ([#1287](https://github.com/opensearch-project/anomaly-detection/pull/1287))
 * Correct handling of null max aggregation values in SearchResponse ([#1292](https://github.com/opensearch-project/anomaly-detection/pull/1292))

release-notes/opensearch-anomaly-detection.release-notes-2.17.1.0.md

@@ -2,5 +2,5 @@
 
 Compatible with OpenSearch 2.17.1
 
-### Big Fixes
+### Bug Fixes
 * Bump BWC Version to 2.18 and Fix Bugs ([#1311](https://github.com/opensearch-project/anomaly-detection/pull/1311))