Rename links for the updated IA on the styleguide

[amrocha]

WHY are these changes introduced?

https://github.com/Shopify/polaris-styleguide/pull/2314

WHAT is this pull request doing?

Fixing links

How to 🎩

Build for the styleguide, then run the broken link checker

Copy-paste this code in playground/Playground.tsx:

/* eslint-disable */

import * as React from 'react';
import {Page, AppProvider} from '@shopify/polaris';

interface State {}

export default class Playground extends React.Component<never, State> {
  render() {
    return (
      <AppProvider>
        <Page title="Playground">
          {/* Add the code you want to test here */}
        </Page>
      </AppProvider>
    );
  }
}

🎩 checklist

• Tested on mobile
• Tested on multiple browsers
• Tested for accessibility
• Updated UNRELEASED.md

[ghost]

👋 Thanks for opening your first pull request. A contributor should give feedback soon. If you haven’t already, please check out the contributing guidelines. You can also join #polaris on the Shopify Partners Slack.

[AndrewMusgrave]

Changes look good, re-ran CI and it looks like it failed again for issues unrelated to the pr

[amrocha]

I know what that is, the config for CircleCI got messed up when we did the switch, I'll see if I can fix it

[tmlayton]

This just needed a rebase, also updated the changelog entry with the new PR link.

[danrosenthal]

What's the status on this PR @amrocha?

[amrocha]

Needs to be merged together with https://github.com/Shopify/polaris-styleguide/pull/2314 which isn't ready yet

[ghost]

🎉 Thanks for your contribution to Polaris React!