add doc for set_user

Author: hanjianqiao

CN/modules/ROOT/nav.adoc

@@ -73,6 +73,7 @@
 *** xref:master/ecosystem_components/pg_readonly.adoc[pg_readonly]
 *** xref:master/ecosystem_components/zhparser.adoc[zhparser]
 *** xref:master/ecosystem_components/pgbackrest.adoc[pgBackRest]
+*** xref:master/ecosystem_components/set_user.adoc[set_user]
 * 监控运维
 ** xref:master/getting-started/daily_monitoring.adoc[日常监控]
 ** xref:master/getting-started/daily_maintenance.adoc[日常维护]

EN/modules/ROOT/nav.adoc

@@ -73,6 +73,7 @@
 *** xref:master/ecosystem_components/pg_readonly_en.adoc[pg_readonly]
 *** xref:master/ecosystem_components/zhparser_en.adoc[zhparser]
 *** xref:master/ecosystem_components/pgbackrest.adoc[pgBackRest]
+*** xref:master/ecosystem_components/set_user.adoc[set_user]
 * Monitor and O&M
 ** xref:master/getting-started/daily_monitoring.adoc[Monitoring]
 ** xref:master/getting-started/daily_maintenance.adoc[Maintenance]