[docs] Prepare Material-UI X (mui#1893)

docs/pages/demo/daterangepicker/index.mdx

@@ -13,9 +13,14 @@ import * as CustomRangeInputs from './CustomRangeInputs.example';
 
 <PageMeta component="DateRangePicker" />
 
-## Date picker
+## Date range picker
 
-[Date pickers](https://material.io/components/pickers/) let users select a date, or a range of dates. They should be suitable for the context in which they appear.
+> ⚠️⚠️ The date range picker is unstable, it's **not suitable** for usage in production. ⚠️⚠️
+
+> The date range picker will be made available in the coming months for production use as part of a paid extension to the community edition (MIT license) of Material-UI.
+> This paid extension will include advanced components (rich data grid, date range picker, tree view drag & drop, etc.). Pricing for early access will start with an affordable plan.
+
+The [date range pickers](https://material.io/components/pickers/) let users select a range of dates. 
 
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