Updating PulseLoader story format (#12818)

ui/components/ui/pulse-loader/README.mdx

@@ -0,0 +1,11 @@
+import { Story, Canvas, ArgsTable } from '@storybook/addon-docs';
+
+import PulseLoader from '.';
+
+# Pulse Loader
+
+Loading indicator with 3 pulsing dots
+
+<Canvas>
+  <Story id="ui-components-ui-pulse-loader-pulse-loader-stories-js--default-story" />
+</Canvas>

ui/components/ui/pulse-loader/pulse-loader.stories.js

@@ -1,9 +1,16 @@
 import React from 'react';
+import README from './README.mdx';
 import PulseLoader from '.';
 
 export default {
   title: 'Components/UI/PulseLoader',
   id: __filename,
+  component: PulseLoader,
+  parameters: {
+    docs: {
+      page: README,
+    },
+  },
 };
 
 export const DefaultStory = () => <PulseLoader />;