[DOC-10001] Add new logging qualifiers to system:completed_requests (#361)

Author: rakhi-prathap

modules/n1ql/pages/n1ql-manage/monitoring-n1ql-query.adoc

@@ -826,6 +826,8 @@ A completed request is logged if _any_ of the qualifiers are met (logical OR).
 `client`:: Log requests from this IP address.
 `user`:: Log requests with this user name.
 `context`:: Log requests with this client context ID.
+`statement`:: Log requests that match the specified LIKE search pattern in the query text.
+`plan`:: Log requests where the specified plan field values appear in the query plan.
 
 For full details, see xref:n1ql-rest-admin:index.adoc#Logging_Parameters[Logging Parameters].