missing docs for che-dashboard API Swagger

[olexii4]

Is your enhancement related to a problem? Please describe

Missing documentation for the che-dashboard Swagger API web user interface {che-server}/dashboard/api/swagger.

Current documentation includes information just about the che-server Swagger API web.

Describe the solution you'd like

Swagger API web UI for che-server and che-dashboard should be in the documentation.

Describe alternatives you've considered

No response

Additional context

No response