Update janitor-provider/main.go

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: jtschelling

janitor-provider/main.go

@@ -12,6 +12,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// Package main implements the janitor-provider gRPC service that provides
+// cloud service provider operations for node lifecycle management including
+// reboot signals, readiness checks, and termination signals.
 package main
 
 import (