@grafana/ui: Update RadioButtonGroup documentation (#23143)

* Add "When to use" info to RadioButtonGroup.mdx

* Clarify more clearly when to use 'Select' instead

* Update RadioButtonGroup.mdx

Add line explaining why we want select for more than four options instead of a radio button group

* Update RadioButtonGroup.mdx

remove part about when elements are triggering changes.

Co-authored-by: Tobias Skarhed <tobias.skarhed@gmail.com>

packages/grafana-ui/src/components/Forms/RadioButtonGroup/RadioButtonGroup.mdx

@@ -5,9 +5,13 @@ import { RadioButtonGroup } from "./RadioButtonGroup";
 
 # RadioButtonGroup
 
-`RadioButtonGroup` is used for selecting single value from multiple options.
+`RadioButtonGroup` is used to select a single value from multiple mutually exclusive options.
 
-Use `RadioButtonGroup` if there are up to four options available. Otherwise use Select component.
+### When to use
+
+Use `RadioButtonGroup` for mutually exclusive selections if there are up to four options available. This is because the `RadioButtonGroup` cannot have more than one row and should still accommodate small resolutions. For a mutually exclusive selection of more than four options, use `Select` component.
+
+Radio buttons can only exist in this type of group. If you want one single option, it's better to use `Switch` instead. To offer multiple choices within the same group or context which are not mutually exclusive, use `Checkbox` instead.
 
 ### Usage