cleanup: enable revive(package-comments) checking

Signed-off-by: zhzhuang-zju <m17799853869@163.com>

.golangci.yml

@@ -66,6 +66,7 @@ linters-settings:
       # https://github.com/mgechev/revive/blob/master/RULES_DESCRIPTIONS.md#if-return
       - name: if-return
         disabled: true
+      - name: package-comments
       - name: superfluous-else
         arguments:
           - preserveScope

pkg/controllers/federatedhpa/monitor/metrics.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-// metrics packages contains metrics which are exposed from the HPA controller.
+// Package monitor contains metrics which are exposed from the HPA controller.
 package monitor
 
 import (