I think at some time in the past the 'command_throttle' parameter changed from a unit of 'milliseconds' to the unit of 'time'.
If you try to compile with a value of 1000 (supposedly milliseconds), compilation fails with the following error:
```
Don't know what '1000' means as it has no time *unit*! Did you mean '1000s'?.
command_throttle: 1000
```
If I put a value of '1s' then compilation works and also this is the time I see that is being used.
* remove migrated documentation
All of these are present now on our https://devices.esphome.io/ site.
The missing ones were pushed with https://github.com/esphome/esphome-devices/pull/385, and the rest ones were already in, thus removing here the duplicates.
* Update modbus.rst
* Update modbus.rst
* Update modbus_controller.rst
* Update ltr390.rst
* Update ltr390.rst
* Update modbus_controller.rst
* fix broken links
* Update index.rst
* Update index.rst
