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Document sensor entity options (#1260)

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docs/core/entity/sensor.md
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@ -68,6 +68,13 @@ If specifying a device class, your sensor entity will need to also return the co
| total | The state represents a total amount that can both increase and decrease, e.g. a net energy meter. Statistics of the accumulated growth or decline of the sensor's value since it was first added is updated every 5 minutes. This state class should not be used for sensors where the absolute value is interesting instead of the accumulated growth or decline, for example remaining battery capacity or CPU load; in such cases state class `measurement` should be used instead.
| total_increasing | Similar to `total`, with the restriction that the state represents a monotonically increasing positive total, e.g. a daily amount of consumed gas, weekly water consumption or lifetime energy consumption. Statistics of the accumulated growth of the sensor's value since it was first added is updated every 5 minutes.
### Entity options
Sensors can be configured by the user, this is done by storing `sensor` entity options in the sensor's entity registry entry.
| Option | Description
| ------ | -----------
| unit_of_measurement | The sensor's unit of measurement can be overridden for sensors with device class `pressure` or `temperature`.
## Restoring sensor states