Zabbix

.........T [ZBX-18874] fixed incorrect links in templates and webhooks documentation

Merge in ZBX/zabbix from feature/ZBX-18874-5.2 to release/5.2

* commit 'ea170736d8b58f2b7456c8e1a07c18a9160fa9e4':
  .........T [ZBX-18874] added changelog entry
  .........T [ZBX-18874] fixed ".xml" in telegram and template_db_postgresql readme
  .........T [ZBX-18874] fixed incorrect links in templates and webhooks documentation