Add missing logcli cmd

docs/maintenance.md

@@ -35,7 +35,8 @@ Query all logs for a keyword:
 
 Query all k8s apps for errors using a regular expression:
 
-    {job=~".*"} |~ "error|fail|exception|fatal"
+    logcli query '{job=~".*"} |~ "error|fail|exception|fatal"'
+
 
 #### Flux