[skip ci] Add comment for export_logs script (#11475)

Signed-off-by: Jenny Li <jing.li@zilliz.com>

tests/scripts/export_logs.sh

@@ -12,6 +12,9 @@
 # or implied. See the License for the specific language governing permissions and limitations under the License.
 
 # export kind logs to artifacts, logs can be seen in the jenkins 
+
+
+# Exit immediately for non zero status
 set -e
 set -x