Add user image lookup examples to UserAvatar story

src/components/UserAvatar/UserAvatar.stories.mdx

@@ -31,8 +31,24 @@ If the `name` prop is passed, the UserAvatar will display the first letter of th
     </Story>
 </Canvas>
 
+## With An Alias
+If you pass a valid career account username, their corresponding picture will be loaded from ECNDB.
+
+**Note:** This is a [CORS](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS) request and will only work when serving the docs from under engineering.purdue.edu. This means the CORS request will fail in development. You can use [this Chrome extension](https://chrome.google.com/webstore/detail/moesif-origin-cors-change/digfbfaphojjndkpccljibejjbppifbc) or similar to temporarily disable CORS protections.
+
+<Canvas>
+    <Story 
+        name="With An Alias"
+        args={{
+            alias: "campb303"
+        }}
+    >
+        { args => <UserAvatar {...args} /> }
+    </Story>
+</Canvas>
+
 ## Forwarded Props
-All props other than `name` are passed to the underlying [MUI Avatar component](https://material-ui.com/api/avatar/).
+All props not listed in the table below are passed to the underlying [MUI Avatar component](https://material-ui.com/api/avatar/).
 
 <Canvas>
     <Story