[skip ci] Add comment into export_logs script (#11442)

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

tests/scripts/export_logs.sh

@@ -11,6 +11,7 @@
 # is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 # 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 
 set -e
 set -x