Docs: Add docs abooout time range URL query params (#20215)

docs/sources/reference/timerange.md

@@ -70,3 +70,10 @@ The `Hide time override info` option allows you to hide the override info text t
 upper right of a panel when overridden time range options.
 
 **Note:** You can only override the dashboard time with relative time ranges. Absolute time ranges are not available.
+
+## Controlling time range using URL
+Time range of a dashboard can be controlled by providing following query parameters in dashboard URL:
+
+- `from` - defines lower limit of the time range, specified in ms epoch
+- `to` - defines upper limit of the time range, specified in ms epoch
+- `time` and `time.window` - defines a time range from `time-time.window/2` to `time+time.window/2`. Both params should be specified in ms. For example `?time=1500000000000&time.window=10000` will result in 10s time range from 1499999995000 to 1500000005000