[JSDSERVER-14916] Assets Index rest api missing documentation

Documents related to Assets, from the Riada portal were migrated to docs.atlassian.com.
However, Assets Index rest api was not migrated.

This is reproducible on Data Center: (yes)

Assets Index rest api information should be displayed.

No information available

An example of triggering a re-index manually is:

Trigger start of assets re-index

curl --request POST --user '<user>:<pass>' <base_url>/rest/assets/1.0/index/reindex/start

Which you can also monitor progress with:

curl --request GET --user '<user>:<pass>' <base_url>/rest/assets/1.0/progress/category/insight-reindex/reindex

Endpoint accepts query parameter “clean”, so it will start a clean reindex
```
/rest/assets/1.0/index/reindex/start?clean=true 
```

No work has yet been logged on this issue.

Jira Service Management Data Center