[Task] <Help Doc For Some HertzBeat Functions>

### Description

Hi, we found that some of HertzBeat's features currently lack corresponding help documentation. Volunteers are welcome to contribute to supplement the help documentation.
Please feel free to pick that ❤️.

doc code here:

https://github.com/apache/hertzbeat/tree/master/home/docs/help
https://github.com/apache/hertzbeat/tree/master/home/i18n/zh-cn/docusaurus-plugin-content-docs/current/help
https://github.com/apache/hertzbeat/blob/master/home/sidebars.json#L71

some feature need latest version but have not publish, we can use the nightly docker images build everyday `apache/hertzbeat:nightly`

docker run -d -p 1157:1157 -p 1158:1158 --name hertzbeat apache/hertzbeat:nightly

### Task List

- [ ] Some missing in new monitoring types
- [ ] Alerting Threshold - RealTime Threshold
- [ ] Alerting Threshold - Periodic Threshold @MasamiYui
- [x] Alerting Integration @bigcyy
- [x] Alerting Group @LiuTianyou
- [x] Alerting Inhibit @LiuTianyou
- [x] Alerting Silence @a-little-fool
- [x] Alerting Alarms Center @bigcyy
- [ ] Some missing in Alerting Notification
- [ ] Status Page
- [x] Collector @sarthakeash

Start with the unchecked items in the issue and compare the existing pages under home/docs/help and home/i18n/zh-cn/docusaurus-plugin-content-docs/current/help, using home/sidebars.json around line 71 to understand navigation. Run apache/hertzbeat:nightly with the supplied Docker command when a feature needs the latest version. Done means the selected missing help pages are documented and linked in the appropriate documentation structure.

Written by the indexing model from the issue text.