Update spinner.md url (#1049)

Author: tanmaychimurkar

components_page/components/spinner.md

@@ -5,7 +5,7 @@ lead: Indicate the loading state of a component or page with the `Spinner` compo
 
 ## Examples
 
-The `Spinner` component can be used either to create a standalone spinner, or used in the same way as [dcc.Loading](https://dash.plot.ly/dash-core-components/loading) by passing children.
+The `Spinner` component can be used either to create a standalone spinner, or used in the same way as [dcc.Loading](https://dash.plotly.com/dash-core-components/loading) by passing children.
 
 To create a simple spinner, just add `dbc.Spinner()` to your layout. By default, `Spinner` uses the current text color for its border color. Override the color of the `Spinner` using the `color` argument and one of the eight supported contextual color names.